core: Drop META_EVENT_ROUTE_WAYLAND_POPUP

This is now unused.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2683>

src/core/display-private.h

@@ -85,10 +85,6 @@ typedef enum
   /* In a window operation like moving or resizing. All events
    * goes to MetaWindow, but not to the actual client window. */
   META_EVENT_ROUTE_WINDOW_OP,
-
-  /* A Wayland application has a popup open. All events go to
-   * the Wayland application. */
-  META_EVENT_ROUTE_WAYLAND_POPUP,
 } MetaEventRoute;
 
 typedef void (* MetaDisplayWindowFunc) (MetaWindow *window,

src/core/events.c

@@ -108,7 +108,6 @@ get_window_for_event (MetaDisplay        *display,
           return NULL;
       }
     case META_EVENT_ROUTE_WINDOW_OP:
-    case META_EVENT_ROUTE_WAYLAND_POPUP:
       return display->grab_window;
     default:
       g_assert_not_reached ();