From 6ceb684442eb26e3bdb8a38bf52264ad55f96a7b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alberts=20Muktup=C4=81vels?= <alberts.muktupavels@gmail.com>
Date: Tue, 20 Sep 2022 15:40:22 +0300
Subject: [PATCH] handle: avoid segfault in invalidate_icons

Screens variable won't be initialized if default icon sizes are
set/changed before using wnck_screen_get_default.

https://bugs.launchpad.net/ubuntu/+source/libwnck3/+bug/1990263
---
 libwnck/wnck-handle.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libwnck/wnck-handle.c b/libwnck/wnck-handle.c
index e12ff882..8d5da45c 100644
--- a/libwnck/wnck-handle.c
+++ b/libwnck/wnck-handle.c
@@ -70,6 +70,9 @@ invalidate_icons (WnckHandle *self)
   Display *xdisplay;
   int i;
 
+  if (self->screens == NULL)
+    return;
+
   xdisplay = _wnck_get_default_display ();
 
   for (i = 0; i < ScreenCount (xdisplay); ++i)
--