Fix clearing of window background for some transparent notification icons

This extends the usage of the native clear region call such that its
called also for windows that have parent relative background all the
way up to a native window. That way we get true background relative
background clearing even to a foreign parent, which means that some
transparent notification icons look right again.

diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
index 2b773c2d855a88d11b95adc7f42eb302b0cf9ea9..0b8b84b2ec27c9a16e061b8badd7fe70bec77371 100644 (file)
--- a/gdk/gdkwindow.c
+++ b/gdk/gdkwindow.c
@@ -4126,6 +4126,24 @@ gdk_window_clear (GdkWindow *window)
                         width, height);
 }
 
+static gboolean
+clears_on_native (GdkWindowObject *private)
+{
+  GdkWindowObject *next;
+
+  next = private;
+  do
+    {
+      private = next;
+      if (gdk_window_has_impl (private))
+       return TRUE;
+      next = private->parent;
+    }
+  while (private->bg_pixmap == GDK_PARENT_RELATIVE_BG &&
+        next && next->window_type != GDK_WINDOW_ROOT);
+  return FALSE;
+}
+
 static void
 gdk_window_clear_region_internal (GdkWindow *window,
                                  GdkRegion *region,
@@ -4141,7 +4159,7 @@ gdk_window_clear_region_internal (GdkWindow *window,
        gdk_window_clear_backing_region_redirect (window, region);
 
       if (GDK_WINDOW_IMPL_GET_IFACE (private->impl)->clear_region &&
-         gdk_window_has_impl (private))
+         clears_on_native (private))
        {
          GdkRegion *copy;
          copy = gdk_region_copy (region);