[gtk+/client-side-windows] Ensure that we always calculate clip regions for root windows

[Alexander Larsson <alexl src gnome org>]

commit 43bc999e6d68b1be8607c42baacdb0fd0fade3f4
Author: Alexander Larsson <alexl redhat com>
Date:   Thu Jun 25 16:59:18 2009 +0200

    Ensure that we always calculate clip regions for root windows
    
    Without this we can't draw to them, which caused problems for e.g.
    gnome-settings-daemon clearing the background when the desktop
    background changed.
    
    Note: We don't actually clip away child windows from the root window,
    the clip is just based on the size of the root window.

 gdk/gdkwindow.c         |   12 ++++++++----
 gdk/x11/gdkevents-x11.c |    1 +
 gdk/x11/gdkwindow-x11.c |    1 +
 3 files changed, 10 insertions(+), 4 deletions(-)
---
diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
index aa10712..c60ca61 100644
--- a/gdk/gdkwindow.c
+++ b/gdk/gdkwindow.c
@@ -774,7 +774,8 @@ recompute_visible_regions_internal (GdkWindowObject *private,
 
       old_clip_region_with_children = private->clip_region_with_children;
       private->clip_region_with_children = gdk_region_copy (private->clip_region);
-      remove_child_area (private, NULL, FALSE, private->clip_region_with_children);
+      if (GDK_WINDOW_TYPE (private) != GDK_WINDOW_ROOT)
+	remove_child_area (private, NULL, FALSE, private->clip_region_with_children);
 
       if (clip_region_changed ||
 	  !gdk_region_equal (private->clip_region_with_children, old_clip_region_with_children))
@@ -817,8 +818,9 @@ recompute_visible_regions_internal (GdkWindowObject *private,
 	}
     }
 
-  /* Update all children, recursively. */
-  if (abs_pos_changed || clip_region_changed || recalculate_children)
+  /* Update all children, recursively (except for root, where children are not exact). */
+  if ((abs_pos_changed || clip_region_changed || recalculate_children) &&
+      GDK_WINDOW_TYPE (private) != GDK_WINDOW_ROOT)
     {
       for (l = private->children; l; l = l->next)
 	{
@@ -840,7 +842,9 @@ recompute_visible_regions_internal (GdkWindowObject *private,
        (private->parent != NULL &&
 	GDK_WINDOW_TYPE (private->parent) != GDK_WINDOW_ROOT)) &&
       /* or for foreign windows */
-      GDK_WINDOW_TYPE (private) != GDK_WINDOW_FOREIGN
+      GDK_WINDOW_TYPE (private) != GDK_WINDOW_FOREIGN &&
+      /* or for the root window */
+      GDK_WINDOW_TYPE (private) != GDK_WINDOW_ROOT
       )
     {
       GDK_WINDOW_IMPL_GET_IFACE (private->impl)->shape_combine_region ((GdkWindow *)private, private->clip_region, 0, 0);
diff --git a/gdk/x11/gdkevents-x11.c b/gdk/x11/gdkevents-x11.c
index 4565b39..ad5107b 100644
--- a/gdk/x11/gdkevents-x11.c
+++ b/gdk/x11/gdkevents-x11.c
@@ -1835,6 +1835,7 @@ gdk_event_translate (GdkDisplay *display,
 	  window_private->width = xevent->xconfigure.width;
 	  window_private->height = xevent->xconfigure.height;
 
+	  _gdk_window_update_size (window);
 	  _gdk_x11_drawable_update_size (window_private->impl);
 	  _gdk_x11_screen_size_changed (screen, xevent);
         }
diff --git a/gdk/x11/gdkwindow-x11.c b/gdk/x11/gdkwindow-x11.c
index 303b18a..9caa17a 100644
--- a/gdk/x11/gdkwindow-x11.c
+++ b/gdk/x11/gdkwindow-x11.c
@@ -450,6 +450,7 @@ _gdk_windowing_window_init (GdkScreen * screen)
   private->abs_y = 0;
   private->width = WidthOfScreen (screen_x11->xscreen);
   private->height = HeightOfScreen (screen_x11->xscreen);
+  _gdk_window_update_size (screen_x11->root_window);
   
   _gdk_xid_table_insert (screen_x11->display,
 			 &screen_x11->xroot_window,