From 8059f9bb3a8a4991a364db797965efffee2dba1d Mon Sep 17 00:00:00 2001
From: Benjamin Otte <otte@redhat.com>
Date: Wed, 1 Nov 2017 15:46:20 +0100
Subject: [PATCH] window: Clear the renderer un unrealize

We disconnect from the GDK window, so the renderer can't keep any useful
state.

Plus, we might be using an entirely different window next time we
realize (after a call to gtk_window_set_display() for example) that should
use a completely different renderer anyway.
---
 gtk/gtkwindow.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index c06b59df4d..c9716a698b 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -6995,8 +6995,8 @@ gtk_window_unrealize (GtkWidget *widget)
                         (GtkCallback) gtk_widget_unrealize,
                         NULL);
 
-  if (priv->renderer != NULL)
-    gsk_renderer_unrealize (priv->renderer);
+  gsk_renderer_unrealize (priv->renderer);
+  g_clear_object (&priv->renderer);
 
   GTK_WIDGET_CLASS (gtk_window_parent_class)->unrealize (widget);