try harder to find a matching key by name

xpra/server/keyboard_config_base.py

@@ -55,6 +55,9 @@ def get_keycode(self, client_keycode:int, keyname:str, pressed:bool,
                 #del self.pressed_translation[client_keycode]
                 return r
         keycode, group = self.do_get_keycode(client_keycode, keyname, pressed, modifiers, keyval, keystr, group)
+        if keycode < 0 and not keyname.islower():
+            keyname = keyname.lower()
+            keycode, group = self.do_get_keycode(client_keycode, keyname, pressed, modifiers, keyval, keystr, group)
         if pressed and keycode not in (None, -1):
             #keep track of it, so we can unpress the same key:
             self.pressed_translation[client_keycode] = keycode, group

xpra/x11/server_keyboard_config.py

@@ -332,6 +332,7 @@ def set_keymap(self, translate_only:bool=False) -> None:
         if translate_only:
             self.keycode_translation = set_keycode_translation(self.x11_keycodes, self.keycodes)
             self.add_gtk_keynames()
+            self.add_loose_matches()
             self.compute_modifiers()
             self.compute_modifier_keynames()
             self.compute_client_modifier_keycodes()
@@ -382,6 +383,7 @@ def set_keymap(self, translate_only:bool=False) -> None:
             log("keyname_for_mod=%s", self.keynames_for_mod)
             clean_keyboard_state()
             self.update_keycode_mappings()
+            self.add_loose_matches()
 
 
     def add_gtk_keynames(self) -> None:
@@ -395,6 +397,12 @@ def add_gtk_keynames(self) -> None:
                 if keyname in DEBUG_KEYSYMS:
                     log.info("add_gtk_keynames: %s=%s", keyname, keycode)
 
+    def add_loose_matches(self) -> None:
+        # add lowercase versions of all keynames
+        for keyname, keycode in tuple(self.keycode_translation.items()):
+            if not keyname.islower():
+                self.keycode_translation[keyname.lower()] = keycode
+
     def set_default_keymap(self) -> None:
         """
         assign a default keymap based on the current X11 server keymap