Gtk4 symlink to upstream

gtk/src/default/gtk-4.0/_colors-public.scss

@@ -0,0 +1 @@
+../../../upstream/gtk-4.0/Adwaita/_colors-public.scss

gtk/src/default/gtk-4.0/_common.scss

@@ -0,0 +1 @@
+../../../upstream/gtk-4.0/Adwaita/_common.scss

gtk/src/default/gtk-4.0/_drawing.scss

@@ -0,0 +1 @@
+../../../upstream/gtk-4.0/Adwaita/_drawing.scss

gtk/src/default/gtk-4.0/_inverted-headerbar.scss

@@ -13,6 +13,8 @@ window.background.csd {
 }
 
 headerbar {
+  color: $fg_color; // reinsert fg_color
+
   @import 'widgets/buttons';
   @import 'widgets/switch';
   @import 'widgets/scale';
@@ -25,6 +27,19 @@ windowhandle separator.vertical {
 
 @import 'widgets/header-bar';
 
+// Inverted headerbar tweaks
+headerbar {
+  box-shadow: inset 0 1px lighten($headerbar_bg_color, 6%); // Top highlight
+
+  // Reinsert windowcontrols size tweak
+  windowcontrols {
+    button {
+      padding: 2px;
+      margin: 0 7px;
+    }
+  }
+}
+
 // Must be imported after _header-bar
 headerbar {
   @import 'widgets/view-switcher';

gtk/src/default/gtk-4.0/_tweaks.scss

@@ -1,6 +1,10 @@
-// Orange close button
+// Smaller windowcontrols and orange close button
 windowcontrols {
+    margin-left: 7px; // Fix windowcontrols misalignement caused by smaller windowcontrols
+
     button {
+        padding: 2px;
+        margin: 0 7px;
         &.close {
             background: $selected_bg_color;
 
@@ -23,11 +27,6 @@ windowcontrols {
     }
 }
 
-// Fix windowcontrols misalignement
-windowcontrols {
-    margin-left: 7px;
-}
-
 // Reducing the amount of the palette's background colors to two
 .sidebar { background-color: $bg_color; }
 
@@ -47,3 +46,16 @@ scale > trough > slider,
 scale > trough > highlight {
     transition: $button_transition;
 }
+
+// Use our own palette for 
+levelbar {
+    > trough {
+        > block {
+            &.high,
+            &:not(.empty) {
+                background-color: $success_color;
+            }
+        }
+    }
+}
+