GdkWindow: Use GPeriodic to repaint windows

Replace the invalidation idle function with a damage registration inside
GPeriodic, using the GDK thread functions.

gdk/gdkwindow.c

@@ -3760,7 +3760,7 @@ gdk_window_set_cairo_clip (GdkDrawable *drawable,
 /* Code for dirty-region queueing
  */
 static GSList *update_windows = NULL;
-static guint update_idle = 0;
+static gboolean damage_reported;
 static gboolean debug_updates = FALSE;
 
 static inline gboolean
@@ -3859,12 +3859,12 @@ gdk_window_remove_update_window (GdkWindow *window)
   update_windows = g_slist_remove (update_windows, window);
 }
 
-static gboolean
-gdk_window_update_idle (gpointer data)
+static void
+gdk_window_repair (GPeriodic *periodic,
+                   gpointer   user_data)
 {
   gdk_window_process_all_updates ();
-
-  return FALSE;
+  damage_reported = FALSE;
 }
 
 static gboolean
@@ -3885,11 +3885,11 @@ gdk_window_schedule_update (GdkWindow *window)
        gdk_window_is_toplevel_frozen (window)))
     return;
 
-  if (!update_idle)
-    update_idle =
-      gdk_threads_add_idle_full (GDK_PRIORITY_REDRAW,
-				 gdk_window_update_idle,
-				 NULL, NULL);
+  if (!damage_reported)
+    {
+      gdk_threads_periodic_damaged (gdk_window_repair, NULL, NULL);
+      damage_reported = TRUE;
+    }
 }
 
 void
@@ -4212,18 +4212,15 @@ gdk_window_process_all_updates (void)
       /* We can't do this now since that would recurse, so
 	 delay it until after the recursion is done. */
       got_recursive_update = TRUE;
-      update_idle = 0;
       return;
     }
 
   in_process_all_updates = TRUE;
   got_recursive_update = FALSE;
 
-  if (update_idle)
-    g_source_remove (update_idle);
+  /* We can't unreport damage, so let it run anyway. */
 
   update_windows = NULL;
-  update_idle = 0;
 
   _gdk_windowing_before_process_all_updates ();
 
@@ -4258,11 +4255,11 @@ gdk_window_process_all_updates (void)
      redraw now so that it eventually happens,
      otherwise we could miss an update if nothing
      else schedules an update. */
-  if (got_recursive_update && !update_idle)
-    update_idle =
-      gdk_threads_add_idle_full (GDK_PRIORITY_REDRAW,
-				 gdk_window_update_idle,
-				 NULL, NULL);
+  if (got_recursive_update && !damage_reported)
+    {
+      gdk_threads_periodic_damaged (gdk_window_repair, NULL, NULL);
+      damage_reported = TRUE;
+    }
 }
 
 /**