window: Move out 'updates frozen' state into implementations

Implementation of said state was just related to X11, so move it into
window-x11.c. The Wayland path always fell back on the returning TRUE,
so just do that for now.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/229

src/core/window-private.h

@@ -565,6 +565,7 @@ struct _MetaWindowClass
   gboolean (*shortcuts_inhibited) (MetaWindow         *window,
                                    ClutterInputDevice *source);
   gboolean (*is_stackable)        (MetaWindow *window);
+  gboolean (*are_updates_frozen)  (MetaWindow *window);
 };
 
 /* These differ from window->has_foo_func in that they consider

src/core/window.c

@@ -3743,14 +3743,7 @@ meta_window_activate_with_workspace (MetaWindow     *window,
 gboolean
 meta_window_updates_are_frozen (MetaWindow *window)
 {
-  if (window->extended_sync_request_counter &&
+  return META_WINDOW_GET_CLASS (window)->are_updates_frozen (window);
-      window->sync_request_serial % 2 == 1)
-    return TRUE;
-
-  if (window->sync_request_serial < window->sync_request_wait_serial)
-    return TRUE;
-
-  return FALSE;
 }
 
 static void

src/wayland/meta-window-wayland.c

@@ -573,6 +573,12 @@ meta_window_wayland_is_stackable (MetaWindow *window)
   return meta_wayland_surface_get_buffer (window->surface) != NULL;
 }
 
+static gboolean
+meta_window_wayland_are_updates_frozen (MetaWindow *window)
+{
+  return FALSE;
+}
+
 static void
 meta_window_wayland_class_init (MetaWindowWaylandClass *klass)
 {
@@ -593,6 +599,7 @@ meta_window_wayland_class_init (MetaWindowWaylandClass *klass)
   window_class->force_restore_shortcuts = meta_window_wayland_force_restore_shortcuts;
   window_class->shortcuts_inhibited = meta_window_wayland_shortcuts_inhibited;
   window_class->is_stackable = meta_window_wayland_is_stackable;
+  window_class->are_updates_frozen = meta_window_wayland_are_updates_frozen;
 }
 
 MetaWindow *

src/x11/window-x11.c

@@ -1577,6 +1577,19 @@ meta_window_x11_is_stackable (MetaWindow *window)
   return !window->override_redirect;
 }
 
+static gboolean
+meta_window_x11_are_updates_frozen (MetaWindow *window)
+{
+  if (window->extended_sync_request_counter &&
+      window->sync_request_serial % 2 == 1)
+    return TRUE;
+
+  if (window->sync_request_serial < window->sync_request_wait_serial)
+    return TRUE;
+
+  return FALSE;
+}
+
 static void
 meta_window_x11_class_init (MetaWindowX11Class *klass)
 {
@@ -1601,6 +1614,7 @@ meta_window_x11_class_init (MetaWindowX11Class *klass)
   window_class->force_restore_shortcuts = meta_window_x11_force_restore_shortcuts;
   window_class->shortcuts_inhibited = meta_window_x11_shortcuts_inhibited;
   window_class->is_stackable = meta_window_x11_is_stackable;
+  window_class->are_updates_frozen = meta_window_x11_are_updates_frozen;
 }
 
 void