window: Allow checking if a window covers a rect

This is just a small function to improve the readability of the code.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1154>

src/core/window.c

@@ -4281,6 +4281,14 @@ meta_window_get_session_geometry (MetaWindow  *window,
     window->size_hints.height_inc;
 }
 
+gboolean
+meta_window_geometry_contains_rect (MetaWindow   *window,
+                                    MtkRectangle *rect)
+{
+  return mtk_rectangle_contains_rect (&window->rect,
+                                      rect);
+}
+
 /**
  * meta_window_get_buffer_rect:
  * @window: a #MetaWindow