Adwaita: Just use .menu, instead of .appmenu

No need for this one-off class, there's no other menus
that could show up here.

gtk/gtkheaderbar.c

@@ -73,7 +73,7 @@
  * ├── box.start
  * │   ╰── box
  * │       ├── [image.titlebutton.icon]
- * │       ├── [menubutton.titlebutton.appmenu]
+ * │       ├── [menubutton.titlebutton.menu]
  * │       ├── [button.titlebutton.minimize]
  * │       ├── [button.titlebutton.maximize]
  * │       ╰── [button.titlebutton.close]
@@ -406,7 +406,7 @@ _gtk_header_bar_update_window_buttons (GtkHeaderBar *bar)
                   gtk_widget_set_valign (button, GTK_ALIGN_CENTER);
                   gtk_menu_button_set_menu_model (GTK_MENU_BUTTON (button), menu);
                   gtk_style_context_add_class (gtk_widget_get_style_context (button), "titlebutton");
-                  gtk_style_context_add_class (gtk_widget_get_style_context (button), "appmenu");
+                  gtk_style_context_add_class (gtk_widget_get_style_context (button), "menu");
                   image = gtk_image_new ();
                   gtk_menu_button_add_child (GTK_MENU_BUTTON (button), image);
                   gtk_widget_set_can_focus (button, FALSE);

gtk/theme/Adwaita/_common.scss

@@ -4576,7 +4576,7 @@ button.titlebutton {
 
   @include _button_text_shadow;
 
-  &:not(.appmenu) {
+  &:not(.menu) {
     border-radius: 9999px;
     -gtk-outline-radius: 9999px;
     padding: 6px;

gtk/theme/Adwaita/gtk-contained-dark.css

@@ -1889,7 +1889,7 @@ messagedialog.csd decoration { border-radius: 8px; box-shadow: 0 1px 2px rgba(0,
 
 button.titlebutton { text-shadow: 0 -1px rgba(0, 0, 0, 0.834353); -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.834353); }
 
-button.titlebutton:not(.appmenu) { border-radius: 9999px; -gtk-outline-radius: 9999px; padding: 6px; margin: 0 2px; min-width: 0; min-height: 0; }
+button.titlebutton:not(.menu) { border-radius: 9999px; -gtk-outline-radius: 9999px; padding: 6px; margin: 0 2px; min-width: 0; min-height: 0; }
 
 button.titlebutton:backdrop { -gtk-icon-shadow: none; }
 

gtk/theme/Adwaita/gtk-contained.css

@@ -1905,7 +1905,7 @@ messagedialog.csd decoration { border-radius: 8px; box-shadow: 0 1px 2px rgba(0,
 
 button.titlebutton { text-shadow: 0 1px rgba(255, 255, 255, 0.769231); -gtk-icon-shadow: 0 1px rgba(255, 255, 255, 0.769231); }
 
-button.titlebutton:not(.appmenu) { border-radius: 9999px; -gtk-outline-radius: 9999px; padding: 6px; margin: 0 2px; min-width: 0; min-height: 0; }
+button.titlebutton:not(.menu) { border-radius: 9999px; -gtk-outline-radius: 9999px; padding: 6px; margin: 0 2px; min-width: 0; min-height: 0; }
 
 button.titlebutton:backdrop { -gtk-icon-shadow: none; }