[gtk+] gdkwindow-x11: Fix graphical regression from 5e325c4

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

commit ea21c4563b8b9d977722436a9b43657435e6c5e8
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Mon Oct 13 02:15:41 2014 -0700

    gdkwindow-x11: Fix graphical regression from 5e325c4
    
    Before 5e325c4, the default BitGravity was NorthWestGravity.
    When static gravities were removed in 5e325c4, the BitGravity regressed
    to the X11 default, Forget. Forget causes giant graphical glitches and
    black flashes when resizing, especially in some environments that aren't
    synchronized to a paint clock yet, like XWayland.
    
    I'm assuming that the author assumed that the default of BitGravity was
    NorthWestGravity, which is the default of WinGravity. Just go ahead and
    fix this regression to make resizing look smooth again.

 gdk/x11/gdkwindow-x11.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/gdk/x11/gdkwindow-x11.c b/gdk/x11/gdkwindow-x11.c
index 3d6ff76..8077f73 100644
--- a/gdk/x11/gdkwindow-x11.c
+++ b/gdk/x11/gdkwindow-x11.c
@@ -1062,6 +1062,9 @@ _gdk_x11_display_create_window_impl (GdkDisplay    *display,
       xattributes.border_pixel = BlackPixel (xdisplay, x11_screen->screen_num);
       xattributes_mask |= CWBorderPixel | CWBackPixel;
 
+      xattributes.bit_gravity = NorthWestGravity;
+      xattributes_mask |= CWBitGravity;
+
       xattributes.colormap = _gdk_visual_get_x11_colormap (window->visual);
       xattributes_mask |= CWColormap;