patch 9.2.1229: GTK4: menu accelerator text is not dimmed

Problem:  GTK4: the accelerator text in menu items is not dimmed
Solution: Add the "dim-label" CSS class to the accelerator label
          (Sylvain Cresto).

closes: #21552

Signed-off-by: Sylvain Cresto <scresto@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/gui_gtk4_menu.c

@@ -450,6 +450,7 @@ vim_menu_item_set_accel(VimMenuItem *self, const char *accel_text)
     assert(self->aux_widget == NULL);
 
     vim_menu_item_set_aux_widget(self, gtk_label_new(accel_text));
+    gtk_widget_add_css_class(self->aux_widget, "dim-label");
     gtk_widget_insert_after(self->aux_widget, GTK_WIDGET(self), self->label);
 }
 

src/version.c

@@ -743,6 +743,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1229,
 /**/
     1228,
 /**/