Fix warning on restacking

Resolves: #2053638

0001-workspaceAnimation-Fix-warning-on-restacking.patch

@@ -0,0 +1,37 @@
+From a8b8bff8a9d32b5c80dd2fdd1f7cbe7615835b76 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Florian=20M=C3=BCllner?= <fmuellner@gnome.org>
+Date: Tue, 22 Feb 2022 21:16:52 +0100
+Subject: [PATCH] workspaceAnimation: Fix warning on restacking
+
+Only workspace groups that are associated with a workspace have a
+background. As a result, when restacking window previews we end up
+passing `undefined` to clutter_actor_set_child_above_sibling()
+instead of null, triggering a warning.
+
+Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2209>
+---
+ js/ui/workspaceAnimation.js | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/js/ui/workspaceAnimation.js b/js/ui/workspaceAnimation.js
+index d240fe156..1731e4027 100644
+--- a/js/ui/workspaceAnimation.js
++++ b/js/ui/workspaceAnimation.js
+@@ -73,11 +73,13 @@ class WorkspaceGroup extends Clutter.Actor {
+             this._shouldShowWindow(w.meta_window));
+ 
+         let lastRecord;
++        const bottomActor = this._background ?? null;
+ 
+         for (const windowActor of windowActors) {
+             const record = this._windowRecords.find(r => r.windowActor === windowActor);
+ 
+-            this.set_child_above_sibling(record.clone, lastRecord ? lastRecord.clone : this._background);
++            this.set_child_above_sibling(record.clone,
++                lastRecord ? lastRecord.clone : bottomActor);
+             lastRecord = record;
+         }
+     }
+-- 
+2.35.1
+

gnome-shell.spec

@@ -41,6 +41,7 @@ Patch39: 0001-status-network-Use-wwan-settings-panel-for-GSM-LTE-M.patch
 Patch40: 0001-welcomeDialog-Adapt-dialog-title.patch
 Patch41: 0001-main-Leak-the-GJS-context-and-ShellGlobal.patch
 Patch42: fix-markup-in-highlighter.patch
+Patch43: 0001-workspaceAnimation-Fix-warning-on-restacking.patch
 
 %define eds_version 3.33.1
 %define gnome_desktop_version 3.35.91
@@ -262,6 +263,8 @@ desktop-file-validate %{buildroot}%{_datadir}/applications/evolution-calendar.de
 * Wed Mar 30 2022 Florian Müllner <fmuellner@redhat.com> - 40.9-3
 - Fix markup handling in highlighter
   Resolves: #2049194
+- Fix warning on restacking
+  Resolves: #2053638
 
 * Mon Feb 28 2022 Ray Strode <rstrode@redhat.com> - 40.9-2
 - Depend on and use background extension