[gtk/resizing-fixes] x11: Use shadow size from GdkToplevelSize

[Matthias Clasen <matthiasc src gnome org>]

commit 5af0e93de00c08102c2d1b6f27ade51e03d13b27
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Aug 12 08:13:03 2020 -0400

    x11: Use shadow size from GdkToplevelSize

 gdk/x11/gdksurface-x11.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/gdk/x11/gdksurface-x11.c b/gdk/x11/gdksurface-x11.c
index b0a49cc737..47edd3d967 100644
--- a/gdk/x11/gdksurface-x11.c
+++ b/gdk/x11/gdksurface-x11.c
@@ -4863,10 +4863,11 @@ gdk_x11_toplevel_present (GdkToplevel       *toplevel,
 
   gdk_toplevel_size_init (&size, bounds_width, bounds_height);
   gdk_toplevel_notify_compute_size (toplevel, &size);
-  g_warn_if_fail (size.width > 0);
-  g_warn_if_fail (size.height > 0);
   width = size.width;
   height = size.height;
+  gdk_x11_surface_set_shadow_width (surface,
+                                    size.shadow_left, size.shadow_right,
+                                    size.shadow_top, size.shadow_bottom);
 
   if (gdk_toplevel_layout_get_resizable (layout))
     {