[gtk+] wayland: Fix "fake root" coords

[Jasper St. Pierre <jstpierre src gnome org>]

commit 0320c3be8e2be4f1d7c2b2465089e71fd43d8b53
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Mon Mar 17 15:27:13 2014 -0400

    wayland: Fix "fake root" coords
    
    We were incorrectly summing up our own window over and over
    rather than the coordinates of the parent windows.

 gdk/wayland/gdkwindow-wayland.c |   12 ++++--------
 1 files changed, 4 insertions(+), 8 deletions(-)
---
diff --git a/gdk/wayland/gdkwindow-wayland.c b/gdk/wayland/gdkwindow-wayland.c
index 9e4c07e..b6d3811 100644
--- a/gdk/wayland/gdkwindow-wayland.c
+++ b/gdk/wayland/gdkwindow-wayland.c
@@ -1098,21 +1098,17 @@ gdk_wayland_window_get_fake_root_coords (GdkWindow *window,
                                          gint      *x_out,
                                          gint      *y_out)
 {
-  GdkWindowImplWayland *impl, *parent_impl;
-  GdkWindow *parent_window;
   gint x_offset = 0, y_offset = 0;
 
-  impl = GDK_WINDOW_IMPL_WAYLAND (window->impl);
-
-  parent_window = impl->transient_for;
-  while (parent_window)
+  while (window)
     {
-      parent_impl = GDK_WINDOW_IMPL_WAYLAND (parent_window->impl);
+      GdkWindowImplWayland *impl;
 
       x_offset += window->x;
       y_offset += window->y;
 
-      parent_window = parent_impl->transient_for;
+      impl = GDK_WINDOW_IMPL_WAYLAND (window->impl);
+      window = impl->transient_for;
     }
 
   *x_out = x_offset;