[gtk+] W32: Don't crash when opacity is set for non-toplevel

[Руслан Ижбулатов <ruslanizhb src gnome org>]

commit 6dede1a0b7b718efd7d8a019064d58ffe637b495
Author: Руслан Ижбулатов <lrn1986 gmail com>
Date:   Fri Jul 25 23:28:31 2014 +0000

    W32: Don't crash when opacity is set for non-toplevel
    
    X11 backend doesn't, and for good reason - main code body does not check
    that the window it sets opacity for is, in fact, toplevel.
    Just silently fail to do anything for non-toplevel windows.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=733769

 gdk/win32/gdkwindow-win32.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/gdk/win32/gdkwindow-win32.c b/gdk/win32/gdkwindow-win32.c
index 3d222a8..a8c7fc0 100644
--- a/gdk/win32/gdkwindow-win32.c
+++ b/gdk/win32/gdkwindow-win32.c
@@ -3175,9 +3175,8 @@ gdk_win32_window_set_opacity (GdkWindow *window,
   PFN_SetLayeredWindowAttributes setLayeredWindowAttributes = NULL;
 
   g_return_if_fail (GDK_IS_WINDOW (window));
-  g_return_if_fail (WINDOW_IS_TOPLEVEL (window));
 
-  if (GDK_WINDOW_DESTROYED (window))
+  if (!WINDOW_IS_TOPLEVEL (window) || GDK_WINDOW_DESTROYED (window))
     return;
 
   if (opacity < 0)