gdk/wayland: Always map windows 'moved-to-rect' as popups

Only popups can make use of the move-to-rect semantics so it makes no
sense to try anything other surface type.

gdk/wayland/gdkwindow-wayland.c

@@ -1877,6 +1877,8 @@ gdk_wayland_window_handle_configure_popup (GdkWindow *window,
                                   &flipped_x,
                                   &flipped_y);
 
+  impl->position_method = POSITION_METHOD_MOVE_TO_RECT;
+
   g_signal_emit_by_name (window,
                          "moved-to-rect",
                          &flipped_rect,
@@ -2806,6 +2808,9 @@ should_map_as_popup (GdkWindow *window)
       break;
     }
 
+  if (impl->position_method == POSITION_METHOD_MOVE_TO_RECT)
+    return TRUE;
+
   return FALSE;
 }