[gtk+] x11: Update root window scale when the screen scale changes

[Alexander Larsson <alexl src gnome org>]

commit 9237da2e574117f21b9b7cb561a1fb4eddf519d5
Author: Alexander Larsson <alexl redhat com>
Date:   Sat Aug 3 16:49:38 2013 +0200

    x11: Update root window scale when the screen scale changes

 gdk/x11/gdkscreen-x11.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/gdk/x11/gdkscreen-x11.c b/gdk/x11/gdkscreen-x11.c
index 19961b5..1baf471 100644
--- a/gdk/x11/gdkscreen-x11.c
+++ b/gdk/x11/gdkscreen-x11.c
@@ -1096,12 +1096,16 @@ _gdk_x11_screen_set_window_scale (GdkX11Screen *x11_screen,
                                  int scale)
 {
   GList *toplevels, *l;
+  GdkWindow *root;
 
   if (x11_screen->window_scale == scale)
     return;
 
   x11_screen->window_scale = scale;
 
+  root = x11_screen->root_window;
+  GDK_WINDOW_IMPL_X11 (root->impl)->window_scale = scale;
+
   toplevels = gdk_screen_get_toplevel_windows (GDK_SCREEN (x11_screen));
 
   for (l = toplevels; l != NULL; l = l->next)