diff --git a/gir b/gir
index 8b9d0bb..fbb95f4 160000
--- a/gir
+++ b/gir
@@ -1 +1 @@
-Subproject commit 8b9d0bb32ed3b76ff9931ee283c07d32af955b60
+Subproject commit fbb95f484ed5f202af9594b6c8d4f59fc0501bf1
diff --git a/sourceview-sys/build.rs b/sourceview-sys/build.rs
index f04eb49..8b8b2c4 100644
--- a/sourceview-sys/build.rs
+++ b/sourceview-sys/build.rs
@@ -53,6 +53,7 @@ fn find() -> Result<(), Error> {
 
     let mut config = Config::new();
     config.atleast_version(version);
+    config.print_system_libs(false);
     if hardcode_shared_libs {
         config.cargo_metadata(false);
     }
diff --git a/sourceview-sys/src/lib.rs b/sourceview-sys/src/lib.rs
index 7eac503..8da0177 100644
--- a/sourceview-sys/src/lib.rs
+++ b/sourceview-sys/src/lib.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ ea993ed)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
diff --git a/src/auto/buffer.rs b/src/auto/buffer.rs
index bd0168a..dd620c0 100644
--- a/src/auto/buffer.rs
+++ b/src/auto/buffer.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -526,48 +526,56 @@ impl<O: IsA<Buffer> + IsA<glib::object::Object>> BufferExt for O {
 
 unsafe extern "C" fn highlight_updated_trampoline<P>(this: *mut ffi::GtkSourceBuffer, start: *mut gtk_ffi::GtkTextIter, end: *mut gtk_ffi::GtkTextIter, f: glib_ffi::gpointer)
 where P: IsA<Buffer> {
+    callback_guard!();
     let f: &&(Fn(&P, &gtk::TextIter, &gtk::TextIter) + 'static) = transmute(f);
     f(&Buffer::from_glib_borrow(this).downcast_unchecked(), &from_glib_borrow(start), &from_glib_borrow(end))
 }
 
 unsafe extern "C" fn redo_trampoline<P>(this: *mut ffi::GtkSourceBuffer, f: glib_ffi::gpointer)
 where P: IsA<Buffer> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Buffer::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn source_mark_updated_trampoline<P>(this: *mut ffi::GtkSourceBuffer, mark: *mut gtk_ffi::GtkTextMark, f: glib_ffi::gpointer)
 where P: IsA<Buffer> {
+    callback_guard!();
     let f: &&(Fn(&P, &gtk::TextMark) + 'static) = transmute(f);
     f(&Buffer::from_glib_borrow(this).downcast_unchecked(), &from_glib_borrow(mark))
 }
 
 unsafe extern "C" fn undo_trampoline<P>(this: *mut ffi::GtkSourceBuffer, f: glib_ffi::gpointer)
 where P: IsA<Buffer> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Buffer::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_can_redo_trampoline<P>(this: *mut ffi::GtkSourceBuffer, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Buffer> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Buffer::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_can_undo_trampoline<P>(this: *mut ffi::GtkSourceBuffer, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Buffer> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Buffer::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_highlight_matching_brackets_trampoline<P>(this: *mut ffi::GtkSourceBuffer, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Buffer> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Buffer::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_highlight_syntax_trampoline<P>(this: *mut ffi::GtkSourceBuffer, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Buffer> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Buffer::from_glib_borrow(this).downcast_unchecked())
 }
@@ -575,30 +583,35 @@ where P: IsA<Buffer> {
 #[cfg(any(feature = "v3_14", feature = "dox"))]
 unsafe extern "C" fn notify_implicit_trailing_newline_trampoline<P>(this: *mut ffi::GtkSourceBuffer, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Buffer> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Buffer::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_language_trampoline<P>(this: *mut ffi::GtkSourceBuffer, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Buffer> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Buffer::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_max_undo_levels_trampoline<P>(this: *mut ffi::GtkSourceBuffer, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Buffer> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Buffer::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_style_scheme_trampoline<P>(this: *mut ffi::GtkSourceBuffer, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Buffer> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Buffer::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_undo_manager_trampoline<P>(this: *mut ffi::GtkSourceBuffer, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Buffer> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Buffer::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/completion.rs b/src/auto/completion.rs
index 1103c78..bf401f7 100644
--- a/src/auto/completion.rs
+++ b/src/auto/completion.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -455,90 +455,105 @@ impl<O: IsA<Completion> + IsA<glib::object::Object> + glib::object::ObjectExt> C
 
 unsafe extern "C" fn activate_proposal_trampoline<P>(this: *mut ffi::GtkSourceCompletion, f: glib_ffi::gpointer)
 where P: IsA<Completion> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Completion::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn hide_trampoline<P>(this: *mut ffi::GtkSourceCompletion, f: glib_ffi::gpointer)
 where P: IsA<Completion> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Completion::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn move_cursor_trampoline<P>(this: *mut ffi::GtkSourceCompletion, step: gtk_ffi::GtkScrollStep, num: libc::c_int, f: glib_ffi::gpointer)
 where P: IsA<Completion> {
+    callback_guard!();
     let f: &&(Fn(&P, gtk::ScrollStep, i32) + 'static) = transmute(f);
     f(&Completion::from_glib_borrow(this).downcast_unchecked(), from_glib(step), num)
 }
 
 unsafe extern "C" fn move_page_trampoline<P>(this: *mut ffi::GtkSourceCompletion, step: gtk_ffi::GtkScrollStep, num: libc::c_int, f: glib_ffi::gpointer)
 where P: IsA<Completion> {
+    callback_guard!();
     let f: &&(Fn(&P, gtk::ScrollStep, i32) + 'static) = transmute(f);
     f(&Completion::from_glib_borrow(this).downcast_unchecked(), from_glib(step), num)
 }
 
 unsafe extern "C" fn populate_context_trampoline<P>(this: *mut ffi::GtkSourceCompletion, context: *mut ffi::GtkSourceCompletionContext, f: glib_ffi::gpointer)
 where P: IsA<Completion> {
+    callback_guard!();
     let f: &&(Fn(&P, &CompletionContext) + 'static) = transmute(f);
     f(&Completion::from_glib_borrow(this).downcast_unchecked(), &from_glib_borrow(context))
 }
 
 unsafe extern "C" fn show_trampoline<P>(this: *mut ffi::GtkSourceCompletion, f: glib_ffi::gpointer)
 where P: IsA<Completion> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Completion::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_accelerators_trampoline<P>(this: *mut ffi::GtkSourceCompletion, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Completion> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Completion::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_auto_complete_delay_trampoline<P>(this: *mut ffi::GtkSourceCompletion, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Completion> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Completion::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_proposal_page_size_trampoline<P>(this: *mut ffi::GtkSourceCompletion, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Completion> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Completion::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_provider_page_size_trampoline<P>(this: *mut ffi::GtkSourceCompletion, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Completion> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Completion::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_remember_info_visibility_trampoline<P>(this: *mut ffi::GtkSourceCompletion, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Completion> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Completion::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_select_on_show_trampoline<P>(this: *mut ffi::GtkSourceCompletion, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Completion> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Completion::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_show_headers_trampoline<P>(this: *mut ffi::GtkSourceCompletion, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Completion> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Completion::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_show_icons_trampoline<P>(this: *mut ffi::GtkSourceCompletion, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Completion> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Completion::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_view_trampoline<P>(this: *mut ffi::GtkSourceCompletion, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Completion> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Completion::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/completion_context.rs b/src/auto/completion_context.rs
index 51edcc7..d84fe38 100644
--- a/src/auto/completion_context.rs
+++ b/src/auto/completion_context.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -117,18 +117,21 @@ impl<O: IsA<CompletionContext> + IsA<glib::object::Object> + glib::object::Objec
 
 unsafe extern "C" fn cancelled_trampoline<P>(this: *mut ffi::GtkSourceCompletionContext, f: glib_ffi::gpointer)
 where P: IsA<CompletionContext> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&CompletionContext::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_activation_trampoline<P>(this: *mut ffi::GtkSourceCompletionContext, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<CompletionContext> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&CompletionContext::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_completion_trampoline<P>(this: *mut ffi::GtkSourceCompletionContext, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<CompletionContext> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&CompletionContext::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/completion_info.rs b/src/auto/completion_info.rs
index 9a4e0cc..877fd18 100644
--- a/src/auto/completion_info.rs
+++ b/src/auto/completion_info.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -86,6 +86,7 @@ impl<O: IsA<CompletionInfo> + IsA<glib::object::Object> + glib::object::ObjectEx
 
 unsafe extern "C" fn before_show_trampoline<P>(this: *mut ffi::GtkSourceCompletionInfo, f: glib_ffi::gpointer)
 where P: IsA<CompletionInfo> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&CompletionInfo::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/completion_item.rs b/src/auto/completion_item.rs
index b4e49af..c6c3e7d 100644
--- a/src/auto/completion_item.rs
+++ b/src/auto/completion_item.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -296,12 +296,14 @@ impl<O: IsA<CompletionItem> + IsA<glib::object::Object>> CompletionItemExt for O
 #[cfg(any(feature = "v3_18", feature = "dox"))]
 unsafe extern "C" fn notify_gicon_trampoline<P>(this: *mut ffi::GtkSourceCompletionItem, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<CompletionItem> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&CompletionItem::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_icon_trampoline<P>(this: *mut ffi::GtkSourceCompletionItem, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<CompletionItem> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&CompletionItem::from_glib_borrow(this).downcast_unchecked())
 }
@@ -309,30 +311,35 @@ where P: IsA<CompletionItem> {
 #[cfg(any(feature = "v3_18", feature = "dox"))]
 unsafe extern "C" fn notify_icon_name_trampoline<P>(this: *mut ffi::GtkSourceCompletionItem, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<CompletionItem> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&CompletionItem::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_info_trampoline<P>(this: *mut ffi::GtkSourceCompletionItem, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<CompletionItem> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&CompletionItem::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_label_trampoline<P>(this: *mut ffi::GtkSourceCompletionItem, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<CompletionItem> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&CompletionItem::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_markup_trampoline<P>(this: *mut ffi::GtkSourceCompletionItem, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<CompletionItem> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&CompletionItem::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_text_trampoline<P>(this: *mut ffi::GtkSourceCompletionItem, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<CompletionItem> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&CompletionItem::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/completion_proposal.rs b/src/auto/completion_proposal.rs
index 9c5eac2..f7d4494 100644
--- a/src/auto/completion_proposal.rs
+++ b/src/auto/completion_proposal.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -133,6 +133,7 @@ impl<O: IsA<CompletionProposal> + IsA<glib::object::Object> + glib::object::Obje
 
 unsafe extern "C" fn changed_trampoline<P>(this: *mut ffi::GtkSourceCompletionProposal, f: glib_ffi::gpointer)
 where P: IsA<CompletionProposal> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&CompletionProposal::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/completion_provider.rs b/src/auto/completion_provider.rs
index 4f60b98..3efc86c 100644
--- a/src/auto/completion_provider.rs
+++ b/src/auto/completion_provider.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
diff --git a/src/auto/completion_words.rs b/src/auto/completion_words.rs
index 4f87ef0..6e16309 100644
--- a/src/auto/completion_words.rs
+++ b/src/auto/completion_words.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -244,48 +244,56 @@ impl<O: IsA<CompletionWords> + IsA<glib::object::Object>> CompletionWordsExt for
 #[cfg(any(feature = "v3_10", feature = "dox"))]
 unsafe extern "C" fn notify_activation_trampoline<P>(this: *mut ffi::GtkSourceCompletionWords, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<CompletionWords> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&CompletionWords::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_icon_trampoline<P>(this: *mut ffi::GtkSourceCompletionWords, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<CompletionWords> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&CompletionWords::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_interactive_delay_trampoline<P>(this: *mut ffi::GtkSourceCompletionWords, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<CompletionWords> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&CompletionWords::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_minimum_word_size_trampoline<P>(this: *mut ffi::GtkSourceCompletionWords, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<CompletionWords> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&CompletionWords::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_name_trampoline<P>(this: *mut ffi::GtkSourceCompletionWords, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<CompletionWords> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&CompletionWords::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_priority_trampoline<P>(this: *mut ffi::GtkSourceCompletionWords, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<CompletionWords> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&CompletionWords::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_proposals_batch_size_trampoline<P>(this: *mut ffi::GtkSourceCompletionWords, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<CompletionWords> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&CompletionWords::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_scan_batch_size_trampoline<P>(this: *mut ffi::GtkSourceCompletionWords, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<CompletionWords> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&CompletionWords::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/encoding.rs b/src/auto/encoding.rs
index 70e6e22..6dedb0c 100644
--- a/src/auto/encoding.rs
+++ b/src/auto/encoding.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
diff --git a/src/auto/enums.rs b/src/auto/enums.rs
index eab0c1c..c5f031f 100644
--- a/src/auto/enums.rs
+++ b/src/auto/enums.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
diff --git a/src/auto/file.rs b/src/auto/file.rs
index d4b50d7..64d5136 100644
--- a/src/auto/file.rs
+++ b/src/auto/file.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -246,6 +246,7 @@ impl<O: IsA<File> + IsA<glib::object::Object>> FileExt for O {
 #[cfg(any(feature = "v3_14", feature = "dox"))]
 unsafe extern "C" fn notify_compression_type_trampoline<P>(this: *mut ffi::GtkSourceFile, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<File> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&File::from_glib_borrow(this).downcast_unchecked())
 }
@@ -253,6 +254,7 @@ where P: IsA<File> {
 #[cfg(any(feature = "v3_14", feature = "dox"))]
 unsafe extern "C" fn notify_encoding_trampoline<P>(this: *mut ffi::GtkSourceFile, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<File> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&File::from_glib_borrow(this).downcast_unchecked())
 }
@@ -260,6 +262,7 @@ where P: IsA<File> {
 #[cfg(any(feature = "v3_14", feature = "dox"))]
 unsafe extern "C" fn notify_location_trampoline<P>(this: *mut ffi::GtkSourceFile, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<File> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&File::from_glib_borrow(this).downcast_unchecked())
 }
@@ -267,6 +270,7 @@ where P: IsA<File> {
 #[cfg(any(feature = "v3_14", feature = "dox"))]
 unsafe extern "C" fn notify_newline_type_trampoline<P>(this: *mut ffi::GtkSourceFile, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<File> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&File::from_glib_borrow(this).downcast_unchecked())
 }
@@ -274,6 +278,7 @@ where P: IsA<File> {
 #[cfg(any(feature = "v3_18", feature = "dox"))]
 unsafe extern "C" fn notify_read_only_trampoline<P>(this: *mut ffi::GtkSourceFile, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<File> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&File::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/file_loader.rs b/src/auto/file_loader.rs
index b950202..6bcf1ee 100644
--- a/src/auto/file_loader.rs
+++ b/src/auto/file_loader.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -78,7 +78,7 @@ pub trait FileLoaderExt {
     fn get_newline_type(&self) -> NewlineType;
 
     //#[cfg(any(feature = "v3_14", feature = "dox"))]
-    //fn load_async<'a, 'b, 'c, P: Into<Option<&'a gio::Cancellable>>, Q: Into<Option<&'b /*Ignored*/gio::FileProgressCallback>>, R: Into<Option</*Unimplemented*/Fundamental: Pointer>>, S: Into<Option<&'c /*Ignored*/glib::DestroyNotify>>, T: FnOnce(Result<(), Error>) + Send + 'static>(&self, io_priority: i32, cancellable: P, progress_callback: Q, progress_callback_data: R, progress_callback_notify: S, callback: T);
+    //fn load_async<'a, 'b, 'c, P: Into<Option<&'a gio::Cancellable>>, Q: Into<Option<&'b /*Ignored*/gio::FileProgressCallback>>, R: Into<Option</*Unimplemented*/Fundamental: Pointer>>, S: Into<Option<&'c /*Ignored*/glib::DestroyNotify>>, T: FnOnce(Result<(), Error>) + Send + 'static>(&self, io_priority: /*Ignored*/glib::Priority, cancellable: P, progress_callback: Q, progress_callback_data: R, progress_callback_notify: S, callback: T);
 
     #[cfg(any(feature = "v3_14", feature = "dox"))]
     fn set_candidate_encodings(&self, candidate_encodings: &[&Encoding]);
@@ -145,7 +145,7 @@ impl<O: IsA<FileLoader> + IsA<glib::object::Object>> FileLoaderExt for O {
     }
 
     //#[cfg(any(feature = "v3_14", feature = "dox"))]
-    //fn load_async<'a, 'b, 'c, P: Into<Option<&'a gio::Cancellable>>, Q: Into<Option<&'b /*Ignored*/gio::FileProgressCallback>>, R: Into<Option</*Unimplemented*/Fundamental: Pointer>>, S: Into<Option<&'c /*Ignored*/glib::DestroyNotify>>, T: FnOnce(Result<(), Error>) + Send + 'static>(&self, io_priority: i32, cancellable: P, progress_callback: Q, progress_callback_data: R, progress_callback_notify: S, callback: T) {
+    //fn load_async<'a, 'b, 'c, P: Into<Option<&'a gio::Cancellable>>, Q: Into<Option<&'b /*Ignored*/gio::FileProgressCallback>>, R: Into<Option</*Unimplemented*/Fundamental: Pointer>>, S: Into<Option<&'c /*Ignored*/glib::DestroyNotify>>, T: FnOnce(Result<(), Error>) + Send + 'static>(&self, io_priority: /*Ignored*/glib::Priority, cancellable: P, progress_callback: Q, progress_callback_data: R, progress_callback_notify: S, callback: T) {
     //    unsafe { TODO: call ffi::gtk_source_file_loader_load_async() }
     //}
 
@@ -196,6 +196,7 @@ impl<O: IsA<FileLoader> + IsA<glib::object::Object>> FileLoaderExt for O {
 #[cfg(any(feature = "v3_14", feature = "dox"))]
 unsafe extern "C" fn notify_buffer_trampoline<P>(this: *mut ffi::GtkSourceFileLoader, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<FileLoader> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&FileLoader::from_glib_borrow(this).downcast_unchecked())
 }
@@ -203,6 +204,7 @@ where P: IsA<FileLoader> {
 #[cfg(any(feature = "v3_14", feature = "dox"))]
 unsafe extern "C" fn notify_file_trampoline<P>(this: *mut ffi::GtkSourceFileLoader, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<FileLoader> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&FileLoader::from_glib_borrow(this).downcast_unchecked())
 }
@@ -210,6 +212,7 @@ where P: IsA<FileLoader> {
 #[cfg(any(feature = "v3_14", feature = "dox"))]
 unsafe extern "C" fn notify_input_stream_trampoline<P>(this: *mut ffi::GtkSourceFileLoader, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<FileLoader> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&FileLoader::from_glib_borrow(this).downcast_unchecked())
 }
@@ -217,6 +220,7 @@ where P: IsA<FileLoader> {
 #[cfg(any(feature = "v3_14", feature = "dox"))]
 unsafe extern "C" fn notify_location_trampoline<P>(this: *mut ffi::GtkSourceFileLoader, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<FileLoader> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&FileLoader::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/file_saver.rs b/src/auto/file_saver.rs
index ca4d554..f861fbd 100644
--- a/src/auto/file_saver.rs
+++ b/src/auto/file_saver.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -82,7 +82,7 @@ pub trait FileSaverExt {
     fn get_newline_type(&self) -> NewlineType;
 
     //#[cfg(any(feature = "v3_14", feature = "dox"))]
-    //fn save_async<'a, 'b, 'c, P: Into<Option<&'a gio::Cancellable>>, Q: Into<Option<&'b /*Ignored*/gio::FileProgressCallback>>, R: Into<Option</*Unimplemented*/Fundamental: Pointer>>, S: Into<Option<&'c /*Ignored*/glib::DestroyNotify>>, T: FnOnce(Result<(), Error>) + Send + 'static>(&self, io_priority: i32, cancellable: P, progress_callback: Q, progress_callback_data: R, progress_callback_notify: S, callback: T);
+    //fn save_async<'a, 'b, 'c, P: Into<Option<&'a gio::Cancellable>>, Q: Into<Option<&'b /*Ignored*/gio::FileProgressCallback>>, R: Into<Option</*Unimplemented*/Fundamental: Pointer>>, S: Into<Option<&'c /*Ignored*/glib::DestroyNotify>>, T: FnOnce(Result<(), Error>) + Send + 'static>(&self, io_priority: /*Ignored*/glib::Priority, cancellable: P, progress_callback: Q, progress_callback_data: R, progress_callback_notify: S, callback: T);
 
     #[cfg(any(feature = "v3_14", feature = "dox"))]
     fn set_compression_type(&self, compression_type: CompressionType);
@@ -169,7 +169,7 @@ impl<O: IsA<FileSaver> + IsA<glib::object::Object>> FileSaverExt for O {
     }
 
     //#[cfg(any(feature = "v3_14", feature = "dox"))]
-    //fn save_async<'a, 'b, 'c, P: Into<Option<&'a gio::Cancellable>>, Q: Into<Option<&'b /*Ignored*/gio::FileProgressCallback>>, R: Into<Option</*Unimplemented*/Fundamental: Pointer>>, S: Into<Option<&'c /*Ignored*/glib::DestroyNotify>>, T: FnOnce(Result<(), Error>) + Send + 'static>(&self, io_priority: i32, cancellable: P, progress_callback: Q, progress_callback_data: R, progress_callback_notify: S, callback: T) {
+    //fn save_async<'a, 'b, 'c, P: Into<Option<&'a gio::Cancellable>>, Q: Into<Option<&'b /*Ignored*/gio::FileProgressCallback>>, R: Into<Option</*Unimplemented*/Fundamental: Pointer>>, S: Into<Option<&'c /*Ignored*/glib::DestroyNotify>>, T: FnOnce(Result<(), Error>) + Send + 'static>(&self, io_priority: /*Ignored*/glib::Priority, cancellable: P, progress_callback: Q, progress_callback_data: R, progress_callback_notify: S, callback: T) {
     //    unsafe { TODO: call ffi::gtk_source_file_saver_save_async() }
     //}
 
@@ -270,6 +270,7 @@ impl<O: IsA<FileSaver> + IsA<glib::object::Object>> FileSaverExt for O {
 #[cfg(any(feature = "v3_14", feature = "dox"))]
 unsafe extern "C" fn notify_buffer_trampoline<P>(this: *mut ffi::GtkSourceFileSaver, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<FileSaver> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&FileSaver::from_glib_borrow(this).downcast_unchecked())
 }
@@ -277,6 +278,7 @@ where P: IsA<FileSaver> {
 #[cfg(any(feature = "v3_14", feature = "dox"))]
 unsafe extern "C" fn notify_compression_type_trampoline<P>(this: *mut ffi::GtkSourceFileSaver, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<FileSaver> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&FileSaver::from_glib_borrow(this).downcast_unchecked())
 }
@@ -284,6 +286,7 @@ where P: IsA<FileSaver> {
 #[cfg(any(feature = "v3_14", feature = "dox"))]
 unsafe extern "C" fn notify_encoding_trampoline<P>(this: *mut ffi::GtkSourceFileSaver, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<FileSaver> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&FileSaver::from_glib_borrow(this).downcast_unchecked())
 }
@@ -291,6 +294,7 @@ where P: IsA<FileSaver> {
 #[cfg(any(feature = "v3_14", feature = "dox"))]
 unsafe extern "C" fn notify_file_trampoline<P>(this: *mut ffi::GtkSourceFileSaver, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<FileSaver> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&FileSaver::from_glib_borrow(this).downcast_unchecked())
 }
@@ -298,6 +302,7 @@ where P: IsA<FileSaver> {
 #[cfg(any(feature = "v3_14", feature = "dox"))]
 unsafe extern "C" fn notify_flags_trampoline<P>(this: *mut ffi::GtkSourceFileSaver, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<FileSaver> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&FileSaver::from_glib_borrow(this).downcast_unchecked())
 }
@@ -305,6 +310,7 @@ where P: IsA<FileSaver> {
 #[cfg(any(feature = "v3_14", feature = "dox"))]
 unsafe extern "C" fn notify_location_trampoline<P>(this: *mut ffi::GtkSourceFileSaver, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<FileSaver> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&FileSaver::from_glib_borrow(this).downcast_unchecked())
 }
@@ -312,6 +318,7 @@ where P: IsA<FileSaver> {
 #[cfg(any(feature = "v3_14", feature = "dox"))]
 unsafe extern "C" fn notify_newline_type_trampoline<P>(this: *mut ffi::GtkSourceFileSaver, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<FileSaver> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&FileSaver::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/flags.rs b/src/auto/flags.rs
index 9a2358a..583e6b3 100644
--- a/src/auto/flags.rs
+++ b/src/auto/flags.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
diff --git a/src/auto/gutter.rs b/src/auto/gutter.rs
index d48c280..945e623 100644
--- a/src/auto/gutter.rs
+++ b/src/auto/gutter.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -216,24 +216,28 @@ impl<O: IsA<Gutter> + IsA<glib::object::Object>> GutterExt for O {
 
 unsafe extern "C" fn notify_view_trampoline<P>(this: *mut ffi::GtkSourceGutter, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Gutter> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Gutter::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_window_type_trampoline<P>(this: *mut ffi::GtkSourceGutter, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Gutter> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Gutter::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_xpad_trampoline<P>(this: *mut ffi::GtkSourceGutter, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Gutter> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Gutter::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_ypad_trampoline<P>(this: *mut ffi::GtkSourceGutter, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Gutter> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Gutter::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/gutter_renderer.rs b/src/auto/gutter_renderer.rs
index f9f08f6..263e03d 100644
--- a/src/auto/gutter_renderer.rs
+++ b/src/auto/gutter_renderer.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -494,96 +494,112 @@ impl<O: IsA<GutterRenderer> + IsA<glib::object::Object>> GutterRendererExt for O
 
 unsafe extern "C" fn activate_trampoline<P>(this: *mut ffi::GtkSourceGutterRenderer, iter: *mut gtk_ffi::GtkTextIter, area: *mut gdk_ffi::GdkRectangle, event: *mut gdk_ffi::GdkEvent, f: glib_ffi::gpointer)
 where P: IsA<GutterRenderer> {
+    callback_guard!();
     let f: &&(Fn(&P, &gtk::TextIter, &gdk::Rectangle, &gdk::Event) + 'static) = transmute(f);
     f(&GutterRenderer::from_glib_borrow(this).downcast_unchecked(), &from_glib_borrow(iter), &from_glib_borrow(area), &from_glib_none(event))
 }
 
 unsafe extern "C" fn query_activatable_trampoline<P>(this: *mut ffi::GtkSourceGutterRenderer, iter: *mut gtk_ffi::GtkTextIter, area: *mut gdk_ffi::GdkRectangle, event: *mut gdk_ffi::GdkEvent, f: glib_ffi::gpointer) -> glib_ffi::gboolean
 where P: IsA<GutterRenderer> {
+    callback_guard!();
     let f: &&(Fn(&P, &gtk::TextIter, &gdk::Rectangle, &gdk::Event) -> bool + 'static) = transmute(f);
     f(&GutterRenderer::from_glib_borrow(this).downcast_unchecked(), &from_glib_borrow(iter), &from_glib_borrow(area), &from_glib_none(event)).to_glib()
 }
 
 unsafe extern "C" fn query_data_trampoline<P>(this: *mut ffi::GtkSourceGutterRenderer, start: *mut gtk_ffi::GtkTextIter, end: *mut gtk_ffi::GtkTextIter, state: ffi::GtkSourceGutterRendererState, f: glib_ffi::gpointer)
 where P: IsA<GutterRenderer> {
+    callback_guard!();
     let f: &&(Fn(&P, &gtk::TextIter, &gtk::TextIter, GutterRendererState) + 'static) = transmute(f);
     f(&GutterRenderer::from_glib_borrow(this).downcast_unchecked(), &from_glib_borrow(start), &from_glib_borrow(end), from_glib(state))
 }
 
 unsafe extern "C" fn query_tooltip_trampoline<P>(this: *mut ffi::GtkSourceGutterRenderer, iter: *mut gtk_ffi::GtkTextIter, area: *mut gdk_ffi::GdkRectangle, x: libc::c_int, y: libc::c_int, tooltip: *mut gtk_ffi::GtkTooltip, f: glib_ffi::gpointer) -> glib_ffi::gboolean
 where P: IsA<GutterRenderer> {
+    callback_guard!();
     let f: &&(Fn(&P, &gtk::TextIter, &gdk::Rectangle, i32, i32, &gtk::Tooltip) -> bool + 'static) = transmute(f);
     f(&GutterRenderer::from_glib_borrow(this).downcast_unchecked(), &from_glib_borrow(iter), &from_glib_borrow(area), x, y, &from_glib_borrow(tooltip)).to_glib()
 }
 
 unsafe extern "C" fn queue_draw_trampoline<P>(this: *mut ffi::GtkSourceGutterRenderer, f: glib_ffi::gpointer)
 where P: IsA<GutterRenderer> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&GutterRenderer::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_alignment_mode_trampoline<P>(this: *mut ffi::GtkSourceGutterRenderer, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<GutterRenderer> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&GutterRenderer::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_background_rgba_trampoline<P>(this: *mut ffi::GtkSourceGutterRenderer, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<GutterRenderer> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&GutterRenderer::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_background_set_trampoline<P>(this: *mut ffi::GtkSourceGutterRenderer, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<GutterRenderer> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&GutterRenderer::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_size_trampoline<P>(this: *mut ffi::GtkSourceGutterRenderer, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<GutterRenderer> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&GutterRenderer::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_view_trampoline<P>(this: *mut ffi::GtkSourceGutterRenderer, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<GutterRenderer> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&GutterRenderer::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_visible_trampoline<P>(this: *mut ffi::GtkSourceGutterRenderer, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<GutterRenderer> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&GutterRenderer::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_window_type_trampoline<P>(this: *mut ffi::GtkSourceGutterRenderer, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<GutterRenderer> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&GutterRenderer::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_xalign_trampoline<P>(this: *mut ffi::GtkSourceGutterRenderer, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<GutterRenderer> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&GutterRenderer::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_xpad_trampoline<P>(this: *mut ffi::GtkSourceGutterRenderer, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<GutterRenderer> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&GutterRenderer::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_yalign_trampoline<P>(this: *mut ffi::GtkSourceGutterRenderer, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<GutterRenderer> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&GutterRenderer::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_ypad_trampoline<P>(this: *mut ffi::GtkSourceGutterRenderer, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<GutterRenderer> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&GutterRenderer::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/gutter_renderer_pixbuf.rs b/src/auto/gutter_renderer_pixbuf.rs
index 974d088..3daea2c 100644
--- a/src/auto/gutter_renderer_pixbuf.rs
+++ b/src/auto/gutter_renderer_pixbuf.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -162,24 +162,28 @@ impl<O: IsA<GutterRendererPixbuf> + IsA<glib::object::Object>> GutterRendererPix
 
 unsafe extern "C" fn notify_gicon_trampoline<P>(this: *mut ffi::GtkSourceGutterRendererPixbuf, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<GutterRendererPixbuf> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&GutterRendererPixbuf::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_icon_name_trampoline<P>(this: *mut ffi::GtkSourceGutterRendererPixbuf, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<GutterRendererPixbuf> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&GutterRendererPixbuf::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_pixbuf_trampoline<P>(this: *mut ffi::GtkSourceGutterRendererPixbuf, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<GutterRendererPixbuf> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&GutterRendererPixbuf::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_stock_id_trampoline<P>(this: *mut ffi::GtkSourceGutterRendererPixbuf, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<GutterRendererPixbuf> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&GutterRendererPixbuf::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/gutter_renderer_text.rs b/src/auto/gutter_renderer_text.rs
index b2c6635..e9cfc8b 100644
--- a/src/auto/gutter_renderer_text.rs
+++ b/src/auto/gutter_renderer_text.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -127,12 +127,14 @@ impl<O: IsA<GutterRendererText> + IsA<glib::object::Object>> GutterRendererTextE
 
 unsafe extern "C" fn notify_markup_trampoline<P>(this: *mut ffi::GtkSourceGutterRendererText, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<GutterRendererText> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&GutterRendererText::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_text_trampoline<P>(this: *mut ffi::GtkSourceGutterRendererText, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<GutterRendererText> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&GutterRendererText::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/language.rs b/src/auto/language.rs
index d69ad49..44f65f6 100644
--- a/src/auto/language.rs
+++ b/src/auto/language.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -152,24 +152,28 @@ impl<O: IsA<Language> + IsA<glib::object::Object>> LanguageExt for O {
 
 unsafe extern "C" fn notify_hidden_trampoline<P>(this: *mut ffi::GtkSourceLanguage, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Language> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Language::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_id_trampoline<P>(this: *mut ffi::GtkSourceLanguage, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Language> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Language::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_name_trampoline<P>(this: *mut ffi::GtkSourceLanguage, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Language> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Language::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_section_trampoline<P>(this: *mut ffi::GtkSourceLanguage, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Language> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Language::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/language_manager.rs b/src/auto/language_manager.rs
index fb09a58..c75d29c 100644
--- a/src/auto/language_manager.rs
+++ b/src/auto/language_manager.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -115,12 +115,14 @@ impl<O: IsA<LanguageManager> + IsA<glib::object::Object>> LanguageManagerExt for
 
 unsafe extern "C" fn notify_language_ids_trampoline<P>(this: *mut ffi::GtkSourceLanguageManager, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<LanguageManager> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&LanguageManager::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_search_path_trampoline<P>(this: *mut ffi::GtkSourceLanguageManager, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<LanguageManager> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&LanguageManager::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/map.rs b/src/auto/map.rs
index d339a12..88a5ac7 100644
--- a/src/auto/map.rs
+++ b/src/auto/map.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -103,6 +103,7 @@ impl<O: IsA<Map> + IsA<glib::object::Object>> MapExt for O {
 
 unsafe extern "C" fn notify_view_trampoline<P>(this: *mut ffi::GtkSourceMap, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Map> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Map::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/mark.rs b/src/auto/mark.rs
index e39fe8a..36dcece 100644
--- a/src/auto/mark.rs
+++ b/src/auto/mark.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -78,6 +78,7 @@ impl<O: IsA<Mark> + IsA<glib::object::Object>> MarkExt for O {
 
 unsafe extern "C" fn notify_category_trampoline<P>(this: *mut ffi::GtkSourceMark, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Mark> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Mark::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/mark_attributes.rs b/src/auto/mark_attributes.rs
index 7a14dc7..75d69bd 100644
--- a/src/auto/mark_attributes.rs
+++ b/src/auto/mark_attributes.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -224,42 +224,49 @@ impl<O: IsA<MarkAttributes> + IsA<glib::object::Object>> MarkAttributesExt for O
 
 unsafe extern "C" fn query_tooltip_markup_trampoline<P>(this: *mut ffi::GtkSourceMarkAttributes, mark: *mut ffi::GtkSourceMark, f: glib_ffi::gpointer) -> *mut libc::c_char
 where P: IsA<MarkAttributes> {
+    callback_guard!();
     let f: &&(Fn(&P, &Mark) -> String + 'static) = transmute(f);
     f(&MarkAttributes::from_glib_borrow(this).downcast_unchecked(), &from_glib_borrow(mark)).to_glib_full()
 }
 
 unsafe extern "C" fn query_tooltip_text_trampoline<P>(this: *mut ffi::GtkSourceMarkAttributes, mark: *mut ffi::GtkSourceMark, f: glib_ffi::gpointer) -> *mut libc::c_char
 where P: IsA<MarkAttributes> {
+    callback_guard!();
     let f: &&(Fn(&P, &Mark) -> String + 'static) = transmute(f);
     f(&MarkAttributes::from_glib_borrow(this).downcast_unchecked(), &from_glib_borrow(mark)).to_glib_full()
 }
 
 unsafe extern "C" fn notify_background_trampoline<P>(this: *mut ffi::GtkSourceMarkAttributes, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<MarkAttributes> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&MarkAttributes::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_gicon_trampoline<P>(this: *mut ffi::GtkSourceMarkAttributes, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<MarkAttributes> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&MarkAttributes::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_icon_name_trampoline<P>(this: *mut ffi::GtkSourceMarkAttributes, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<MarkAttributes> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&MarkAttributes::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_pixbuf_trampoline<P>(this: *mut ffi::GtkSourceMarkAttributes, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<MarkAttributes> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&MarkAttributes::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_stock_id_trampoline<P>(this: *mut ffi::GtkSourceMarkAttributes, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<MarkAttributes> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&MarkAttributes::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/mod.rs b/src/auto/mod.rs
index 422d2ed..7ca84af 100644
--- a/src/auto/mod.rs
+++ b/src/auto/mod.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
diff --git a/src/auto/print_compositor.rs b/src/auto/print_compositor.rs
index d633026..b5559a5 100644
--- a/src/auto/print_compositor.rs
+++ b/src/auto/print_compositor.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -465,72 +465,84 @@ impl<O: IsA<PrintCompositor> + IsA<glib::object::Object>> PrintCompositorExt for
 
 unsafe extern "C" fn notify_body_font_name_trampoline<P>(this: *mut ffi::GtkSourcePrintCompositor, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<PrintCompositor> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&PrintCompositor::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_buffer_trampoline<P>(this: *mut ffi::GtkSourcePrintCompositor, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<PrintCompositor> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&PrintCompositor::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_footer_font_name_trampoline<P>(this: *mut ffi::GtkSourcePrintCompositor, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<PrintCompositor> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&PrintCompositor::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_header_font_name_trampoline<P>(this: *mut ffi::GtkSourcePrintCompositor, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<PrintCompositor> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&PrintCompositor::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_highlight_syntax_trampoline<P>(this: *mut ffi::GtkSourcePrintCompositor, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<PrintCompositor> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&PrintCompositor::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_line_numbers_font_name_trampoline<P>(this: *mut ffi::GtkSourcePrintCompositor, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<PrintCompositor> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&PrintCompositor::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_n_pages_trampoline<P>(this: *mut ffi::GtkSourcePrintCompositor, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<PrintCompositor> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&PrintCompositor::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_print_footer_trampoline<P>(this: *mut ffi::GtkSourcePrintCompositor, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<PrintCompositor> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&PrintCompositor::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_print_header_trampoline<P>(this: *mut ffi::GtkSourcePrintCompositor, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<PrintCompositor> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&PrintCompositor::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_print_line_numbers_trampoline<P>(this: *mut ffi::GtkSourcePrintCompositor, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<PrintCompositor> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&PrintCompositor::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_tab_width_trampoline<P>(this: *mut ffi::GtkSourcePrintCompositor, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<PrintCompositor> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&PrintCompositor::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_wrap_mode_trampoline<P>(this: *mut ffi::GtkSourcePrintCompositor, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<PrintCompositor> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&PrintCompositor::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/region.rs b/src/auto/region.rs
index 44a6f64..5278865 100644
--- a/src/auto/region.rs
+++ b/src/auto/region.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -184,6 +184,7 @@ impl<O: IsA<Region> + IsA<glib::object::Object>> RegionExt for O {
 #[cfg(any(feature = "v3_22", feature = "dox"))]
 unsafe extern "C" fn notify_buffer_trampoline<P>(this: *mut ffi::GtkSourceRegion, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Region> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Region::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/search_context.rs b/src/auto/search_context.rs
index f5239e1..ac33c34 100644
--- a/src/auto/search_context.rs
+++ b/src/auto/search_context.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -170,6 +170,7 @@ impl<O: IsA<SearchContext> + IsA<glib::object::Object>> SearchContextExt for O {
         let user_data: Box<Box<Q>> = Box::new(Box::new(callback));
         unsafe extern "C" fn backward_async_trampoline<Q: FnOnce(Result<(gtk::TextIter, gtk::TextIter), Error>) + Send + 'static>(_source_object: *mut gobject_ffi::GObject, res: *mut gio_ffi::GAsyncResult, user_data: glib_ffi::gpointer)
         {
+            callback_guard!();
             let mut error = ptr::null_mut();
             let mut match_start = gtk::TextIter::uninitialized();
             let mut match_end = gtk::TextIter::uninitialized();
@@ -217,6 +218,7 @@ impl<O: IsA<SearchContext> + IsA<glib::object::Object>> SearchContextExt for O {
         let user_data: Box<Box<Q>> = Box::new(Box::new(callback));
         unsafe extern "C" fn forward_async_trampoline<Q: FnOnce(Result<(gtk::TextIter, gtk::TextIter), Error>) + Send + 'static>(_source_object: *mut gobject_ffi::GObject, res: *mut gio_ffi::GAsyncResult, user_data: glib_ffi::gpointer)
         {
+            callback_guard!();
             let mut error = ptr::null_mut();
             let mut match_start = gtk::TextIter::uninitialized();
             let mut match_end = gtk::TextIter::uninitialized();
@@ -398,6 +400,7 @@ impl<O: IsA<SearchContext> + IsA<glib::object::Object>> SearchContextExt for O {
 #[cfg(any(feature = "v3_10", feature = "dox"))]
 unsafe extern "C" fn notify_buffer_trampoline<P>(this: *mut ffi::GtkSourceSearchContext, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<SearchContext> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&SearchContext::from_glib_borrow(this).downcast_unchecked())
 }
@@ -405,6 +408,7 @@ where P: IsA<SearchContext> {
 #[cfg(any(feature = "v3_10", feature = "dox"))]
 unsafe extern "C" fn notify_highlight_trampoline<P>(this: *mut ffi::GtkSourceSearchContext, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<SearchContext> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&SearchContext::from_glib_borrow(this).downcast_unchecked())
 }
@@ -412,6 +416,7 @@ where P: IsA<SearchContext> {
 #[cfg(any(feature = "v3_16", feature = "dox"))]
 unsafe extern "C" fn notify_match_style_trampoline<P>(this: *mut ffi::GtkSourceSearchContext, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<SearchContext> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&SearchContext::from_glib_borrow(this).downcast_unchecked())
 }
@@ -419,6 +424,7 @@ where P: IsA<SearchContext> {
 #[cfg(any(feature = "v3_10", feature = "dox"))]
 unsafe extern "C" fn notify_occurrences_count_trampoline<P>(this: *mut ffi::GtkSourceSearchContext, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<SearchContext> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&SearchContext::from_glib_borrow(this).downcast_unchecked())
 }
@@ -426,6 +432,7 @@ where P: IsA<SearchContext> {
 #[cfg(any(feature = "v3_10", feature = "dox"))]
 unsafe extern "C" fn notify_regex_error_trampoline<P>(this: *mut ffi::GtkSourceSearchContext, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<SearchContext> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&SearchContext::from_glib_borrow(this).downcast_unchecked())
 }
@@ -433,6 +440,7 @@ where P: IsA<SearchContext> {
 #[cfg(any(feature = "v3_10", feature = "dox"))]
 unsafe extern "C" fn notify_settings_trampoline<P>(this: *mut ffi::GtkSourceSearchContext, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<SearchContext> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&SearchContext::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/search_settings.rs b/src/auto/search_settings.rs
index 6caebb5..bc52fc2 100644
--- a/src/auto/search_settings.rs
+++ b/src/auto/search_settings.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -214,6 +214,7 @@ impl<O: IsA<SearchSettings> + IsA<glib::object::Object>> SearchSettingsExt for O
 #[cfg(any(feature = "v3_10", feature = "dox"))]
 unsafe extern "C" fn notify_at_word_boundaries_trampoline<P>(this: *mut ffi::GtkSourceSearchSettings, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<SearchSettings> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&SearchSettings::from_glib_borrow(this).downcast_unchecked())
 }
@@ -221,6 +222,7 @@ where P: IsA<SearchSettings> {
 #[cfg(any(feature = "v3_10", feature = "dox"))]
 unsafe extern "C" fn notify_case_sensitive_trampoline<P>(this: *mut ffi::GtkSourceSearchSettings, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<SearchSettings> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&SearchSettings::from_glib_borrow(this).downcast_unchecked())
 }
@@ -228,6 +230,7 @@ where P: IsA<SearchSettings> {
 #[cfg(any(feature = "v3_10", feature = "dox"))]
 unsafe extern "C" fn notify_regex_enabled_trampoline<P>(this: *mut ffi::GtkSourceSearchSettings, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<SearchSettings> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&SearchSettings::from_glib_borrow(this).downcast_unchecked())
 }
@@ -235,6 +238,7 @@ where P: IsA<SearchSettings> {
 #[cfg(any(feature = "v3_10", feature = "dox"))]
 unsafe extern "C" fn notify_search_text_trampoline<P>(this: *mut ffi::GtkSourceSearchSettings, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<SearchSettings> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&SearchSettings::from_glib_borrow(this).downcast_unchecked())
 }
@@ -242,6 +246,7 @@ where P: IsA<SearchSettings> {
 #[cfg(any(feature = "v3_10", feature = "dox"))]
 unsafe extern "C" fn notify_wrap_around_trampoline<P>(this: *mut ffi::GtkSourceSearchSettings, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<SearchSettings> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&SearchSettings::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/space_drawer.rs b/src/auto/space_drawer.rs
index 569b89c..30fc8b5 100644
--- a/src/auto/space_drawer.rs
+++ b/src/auto/space_drawer.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -154,6 +154,7 @@ impl<O: IsA<SpaceDrawer> + IsA<glib::object::Object>> SpaceDrawerExt for O {
 #[cfg(any(feature = "v3_24", feature = "dox"))]
 unsafe extern "C" fn notify_enable_matrix_trampoline<P>(this: *mut ffi::GtkSourceSpaceDrawer, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<SpaceDrawer> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&SpaceDrawer::from_glib_borrow(this).downcast_unchecked())
 }
@@ -161,6 +162,7 @@ where P: IsA<SpaceDrawer> {
 #[cfg(any(feature = "v3_24", feature = "dox"))]
 unsafe extern "C" fn notify_matrix_trampoline<P>(this: *mut ffi::GtkSourceSpaceDrawer, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<SpaceDrawer> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&SpaceDrawer::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/style.rs b/src/auto/style.rs
index 5d144cc..2bf4c91 100644
--- a/src/auto/style.rs
+++ b/src/auto/style.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -415,114 +415,133 @@ impl<O: IsA<Style> + IsA<glib::object::Object>> StyleExt for O {
 
 unsafe extern "C" fn notify_background_trampoline<P>(this: *mut ffi::GtkSourceStyle, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Style> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Style::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_background_set_trampoline<P>(this: *mut ffi::GtkSourceStyle, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Style> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Style::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_bold_trampoline<P>(this: *mut ffi::GtkSourceStyle, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Style> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Style::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_bold_set_trampoline<P>(this: *mut ffi::GtkSourceStyle, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Style> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Style::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_foreground_trampoline<P>(this: *mut ffi::GtkSourceStyle, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Style> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Style::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_foreground_set_trampoline<P>(this: *mut ffi::GtkSourceStyle, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Style> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Style::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_italic_trampoline<P>(this: *mut ffi::GtkSourceStyle, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Style> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Style::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_italic_set_trampoline<P>(this: *mut ffi::GtkSourceStyle, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Style> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Style::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_line_background_trampoline<P>(this: *mut ffi::GtkSourceStyle, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Style> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Style::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_line_background_set_trampoline<P>(this: *mut ffi::GtkSourceStyle, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Style> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Style::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_pango_underline_trampoline<P>(this: *mut ffi::GtkSourceStyle, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Style> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Style::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_scale_trampoline<P>(this: *mut ffi::GtkSourceStyle, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Style> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Style::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_scale_set_trampoline<P>(this: *mut ffi::GtkSourceStyle, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Style> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Style::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_strikethrough_trampoline<P>(this: *mut ffi::GtkSourceStyle, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Style> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Style::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_strikethrough_set_trampoline<P>(this: *mut ffi::GtkSourceStyle, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Style> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Style::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_underline_trampoline<P>(this: *mut ffi::GtkSourceStyle, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Style> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Style::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_underline_color_trampoline<P>(this: *mut ffi::GtkSourceStyle, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Style> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Style::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_underline_color_set_trampoline<P>(this: *mut ffi::GtkSourceStyle, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Style> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Style::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_underline_set_trampoline<P>(this: *mut ffi::GtkSourceStyle, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Style> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Style::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/style_scheme.rs b/src/auto/style_scheme.rs
index fba59d5..a3e4108 100644
--- a/src/auto/style_scheme.rs
+++ b/src/auto/style_scheme.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -119,24 +119,28 @@ impl<O: IsA<StyleScheme> + IsA<glib::object::Object>> StyleSchemeExt for O {
 
 unsafe extern "C" fn notify_description_trampoline<P>(this: *mut ffi::GtkSourceStyleScheme, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<StyleScheme> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&StyleScheme::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_filename_trampoline<P>(this: *mut ffi::GtkSourceStyleScheme, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<StyleScheme> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&StyleScheme::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_id_trampoline<P>(this: *mut ffi::GtkSourceStyleScheme, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<StyleScheme> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&StyleScheme::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_name_trampoline<P>(this: *mut ffi::GtkSourceStyleScheme, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<StyleScheme> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&StyleScheme::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/style_scheme_chooser.rs b/src/auto/style_scheme_chooser.rs
index 9d0da8a..a5dda59 100644
--- a/src/auto/style_scheme_chooser.rs
+++ b/src/auto/style_scheme_chooser.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -71,6 +71,7 @@ impl<O: IsA<StyleSchemeChooser> + IsA<glib::object::Object>> StyleSchemeChooserE
 #[cfg(any(feature = "v3_16", feature = "dox"))]
 unsafe extern "C" fn notify_style_scheme_trampoline<P>(this: *mut ffi::GtkSourceStyleSchemeChooser, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<StyleSchemeChooser> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&StyleSchemeChooser::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/style_scheme_chooser_button.rs b/src/auto/style_scheme_chooser_button.rs
index 5e51f2b..82600a3 100644
--- a/src/auto/style_scheme_chooser_button.rs
+++ b/src/auto/style_scheme_chooser_button.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
diff --git a/src/auto/style_scheme_chooser_widget.rs b/src/auto/style_scheme_chooser_widget.rs
index e5fd62f..16875d2 100644
--- a/src/auto/style_scheme_chooser_widget.rs
+++ b/src/auto/style_scheme_chooser_widget.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
diff --git a/src/auto/style_scheme_manager.rs b/src/auto/style_scheme_manager.rs
index 6c2c014..9f81a7c 100644
--- a/src/auto/style_scheme_manager.rs
+++ b/src/auto/style_scheme_manager.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -127,12 +127,14 @@ impl<O: IsA<StyleSchemeManager> + IsA<glib::object::Object>> StyleSchemeManagerE
 
 unsafe extern "C" fn notify_scheme_ids_trampoline<P>(this: *mut ffi::GtkSourceStyleSchemeManager, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<StyleSchemeManager> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&StyleSchemeManager::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_search_path_trampoline<P>(this: *mut ffi::GtkSourceStyleSchemeManager, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<StyleSchemeManager> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&StyleSchemeManager::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/tag.rs b/src/auto/tag.rs
index 67625f8..cdaceeb 100644
--- a/src/auto/tag.rs
+++ b/src/auto/tag.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -122,6 +122,7 @@ impl<O: IsA<Tag> + IsA<glib::object::Object>> TagExt for O {
 #[cfg(any(feature = "v3_20", feature = "dox"))]
 unsafe extern "C" fn notify_draw_spaces_trampoline<P>(this: *mut ffi::GtkSourceTag, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Tag> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Tag::from_glib_borrow(this).downcast_unchecked())
 }
@@ -129,6 +130,7 @@ where P: IsA<Tag> {
 #[cfg(any(feature = "v3_20", feature = "dox"))]
 unsafe extern "C" fn notify_draw_spaces_set_trampoline<P>(this: *mut ffi::GtkSourceTag, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<Tag> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&Tag::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/undo_manager.rs b/src/auto/undo_manager.rs
index 796863a..3ab3b06 100644
--- a/src/auto/undo_manager.rs
+++ b/src/auto/undo_manager.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -126,12 +126,14 @@ impl<O: IsA<UndoManager> + IsA<glib::object::Object> + glib::object::ObjectExt>
 
 unsafe extern "C" fn can_redo_changed_trampoline<P>(this: *mut ffi::GtkSourceUndoManager, f: glib_ffi::gpointer)
 where P: IsA<UndoManager> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&UndoManager::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn can_undo_changed_trampoline<P>(this: *mut ffi::GtkSourceUndoManager, f: glib_ffi::gpointer)
 where P: IsA<UndoManager> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&UndoManager::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/auto/view.rs b/src/auto/view.rs
index c8c0b74..3f30426 100644
--- a/src/auto/view.rs
+++ b/src/auto/view.rs
@@ -1,4 +1,4 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 8b9d0bb)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ fbb95f4)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 77d1f70)
 // DO NOT EDIT
 
@@ -714,6 +714,7 @@ impl<O: IsA<View> + IsA<glib::object::Object> + glib::object::ObjectExt> ViewExt
 #[cfg(any(feature = "v3_16", feature = "dox"))]
 unsafe extern "C" fn change_case_trampoline<P>(this: *mut ffi::GtkSourceView, case_type: ffi::GtkSourceChangeCaseType, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P, ChangeCaseType) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked(), from_glib(case_type))
 }
@@ -721,6 +722,7 @@ where P: IsA<View> {
 #[cfg(any(feature = "v3_16", feature = "dox"))]
 unsafe extern "C" fn change_number_trampoline<P>(this: *mut ffi::GtkSourceView, count: libc::c_int, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P, i32) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked(), count)
 }
@@ -728,18 +730,21 @@ where P: IsA<View> {
 #[cfg(any(feature = "v3_16", feature = "dox"))]
 unsafe extern "C" fn join_lines_trampoline<P>(this: *mut ffi::GtkSourceView, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn line_mark_activated_trampoline<P>(this: *mut ffi::GtkSourceView, iter: *mut gtk_ffi::GtkTextIter, event: *mut gdk_ffi::GdkEvent, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P, &gtk::TextIter, &gdk::Event) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked(), &from_glib_borrow(iter), &from_glib_none(event))
 }
 
 unsafe extern "C" fn move_lines_trampoline<P>(this: *mut ffi::GtkSourceView, copy: glib_ffi::gboolean, count: libc::c_int, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P, bool, i32) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked(), from_glib(copy), count)
 }
@@ -747,42 +752,49 @@ where P: IsA<View> {
 #[cfg(any(feature = "v3_16", feature = "dox"))]
 unsafe extern "C" fn move_to_matching_bracket_trampoline<P>(this: *mut ffi::GtkSourceView, extend_selection: glib_ffi::gboolean, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P, bool) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked(), from_glib(extend_selection))
 }
 
 unsafe extern "C" fn move_words_trampoline<P>(this: *mut ffi::GtkSourceView, count: libc::c_int, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P, i32) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked(), count)
 }
 
 unsafe extern "C" fn redo_trampoline<P>(this: *mut ffi::GtkSourceView, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn show_completion_trampoline<P>(this: *mut ffi::GtkSourceView, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn smart_home_end_trampoline<P>(this: *mut ffi::GtkSourceView, iter: *mut gtk_ffi::GtkTextIter, count: libc::c_int, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P, &gtk::TextIter, i32) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked(), &from_glib_borrow(iter), count)
 }
 
 unsafe extern "C" fn undo_trampoline<P>(this: *mut ffi::GtkSourceView, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_auto_indent_trampoline<P>(this: *mut ffi::GtkSourceView, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked())
 }
@@ -790,66 +802,77 @@ where P: IsA<View> {
 #[cfg(any(feature = "v3_16", feature = "dox"))]
 unsafe extern "C" fn notify_background_pattern_trampoline<P>(this: *mut ffi::GtkSourceView, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_completion_trampoline<P>(this: *mut ffi::GtkSourceView, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_draw_spaces_trampoline<P>(this: *mut ffi::GtkSourceView, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_highlight_current_line_trampoline<P>(this: *mut ffi::GtkSourceView, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_indent_on_tab_trampoline<P>(this: *mut ffi::GtkSourceView, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_indent_width_trampoline<P>(this: *mut ffi::GtkSourceView, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_insert_spaces_instead_of_tabs_trampoline<P>(this: *mut ffi::GtkSourceView, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_right_margin_position_trampoline<P>(this: *mut ffi::GtkSourceView, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_show_line_marks_trampoline<P>(this: *mut ffi::GtkSourceView, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_show_line_numbers_trampoline<P>(this: *mut ffi::GtkSourceView, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_show_right_margin_trampoline<P>(this: *mut ffi::GtkSourceView, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked())
 }
@@ -857,12 +880,14 @@ where P: IsA<View> {
 #[cfg(any(feature = "v3_18", feature = "dox"))]
 unsafe extern "C" fn notify_smart_backspace_trampoline<P>(this: *mut ffi::GtkSourceView, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_smart_home_end_trampoline<P>(this: *mut ffi::GtkSourceView, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked())
 }
@@ -870,12 +895,14 @@ where P: IsA<View> {
 #[cfg(any(feature = "v3_24", feature = "dox"))]
 unsafe extern "C" fn notify_space_drawer_trampoline<P>(this: *mut ffi::GtkSourceView, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked())
 }
 
 unsafe extern "C" fn notify_tab_width_trampoline<P>(this: *mut ffi::GtkSourceView, _param_spec: glib_ffi::gpointer, f: glib_ffi::gpointer)
 where P: IsA<View> {
+    callback_guard!();
     let f: &&(Fn(&P) + 'static) = transmute(f);
     f(&View::from_glib_borrow(this).downcast_unchecked())
 }
diff --git a/src/lib.rs b/src/lib.rs
index dcdf030..caea2e7 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -45,6 +45,12 @@ pub mod prelude {
     pub use auto::traits::*;
 }
 
+macro_rules! callback_guard {
+    () => (
+        let _guard = ::glib::CallbackGuard::new();
+    )
+}
+
 mod auto;
 mod completion;
 mod completion_info;