[gtk: 1/2] x11: fix crash on idle compute size without layout

[Matthias Clasen <matthiasc src gnome org>]

commit 53af35d25636118ad513b21fee670b38b0c2a814
Author: Rafostar <40623528+Rafostar users noreply github com>
Date:   Sun Jan 3 18:02:31 2021 +0100

    x11: fix crash on idle compute size without layout
    
    On x11 toplevel layout is not created before toplevel
    is presented, but GTK tries to update it on idle
    which leads to a crash due to accessing property
    of undefined object. Treat soon to be created layout
    as a layout with default values upon creation (resizable).

 gdk/x11/gdksurface-x11.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gdk/x11/gdksurface-x11.c b/gdk/x11/gdksurface-x11.c
index d67dacf77c..207c34e419 100644
--- a/gdk/x11/gdksurface-x11.c
+++ b/gdk/x11/gdksurface-x11.c
@@ -291,7 +291,7 @@ compute_toplevel_size (GdkSurface *surface,
       GdkGeometry geometry;
       GdkSurfaceHints mask;
 
-      if (gdk_toplevel_layout_get_resizable (impl->toplevel_layout))
+      if (!impl->toplevel_layout || gdk_toplevel_layout_get_resizable (impl->toplevel_layout))
         {
           geometry.min_width = size.min_width;
           geometry.min_height = size.min_height;