[gtk+/transparent-windows: 8/8] gdk: Fix repaint of layered region during move_region

[Alexander Larsson <alexl src gnome org>]

commit 7a263c68a0ad87019f36485aa108fb655e3eeaad
Author: Alexander Larsson <alexl redhat com>
Date:   Thu Dec 1 16:45:36 2011 +0100

    gdk: Fix repaint of layered region during move_region

 gdk/gdkwindow.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
index c13b9a8..04026ac 100644
--- a/gdk/gdkwindow.c
+++ b/gdk/gdkwindow.c
@@ -6409,12 +6409,17 @@ gdk_window_move_region (GdkWindow       *window,
   impl_window = gdk_window_get_impl_window (window);
 
   /* compute source regions */
-  copy_area = cairo_region_copy (region);
+  if (window->has_alpha_background)
+    copy_area = cairo_region_create (); /* Copy nothing for alpha windows */
+  else
+    copy_area = cairo_region_copy (region);
   cairo_region_intersect (copy_area, window->clip_region_with_children);
+  cairo_region_subtract (copy_area, window->layered_region);
 
   /* compute destination regions */
   cairo_region_translate (copy_area, dx, dy);
   cairo_region_intersect (copy_area, window->clip_region_with_children);
+  cairo_region_subtract (copy_area, window->layered_region);
 
   /* Invalidate parts of the region (source and dest) not covered
      by the copy */