[gnome-shell/wip/rstrode/rhel-7.9: 50/86] workspaceThumbnail: Initialize signal handler ids to 0

[Ray Strode <halfline src gnome org>]

commit b020954e29639441e018f66121171e8df23e703b
Author: Jonas Ådahl <jadahl gmail com>
Date:   Wed Apr 25 22:03:16 2018 +0200

    workspaceThumbnail: Initialize signal handler ids to 0
    
    They are used in conditions, so initialize them first.

 js/ui/workspaceThumbnail.js | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/js/ui/workspaceThumbnail.js b/js/ui/workspaceThumbnail.js
index 381169ea62..82686e68f2 100644
--- a/js/ui/workspaceThumbnail.js
+++ b/js/ui/workspaceThumbnail.js
@@ -678,6 +678,11 @@ var ThumbnailsBox = new Lang.Class({
             this._updateSwitcherVisibility.bind(this));
 
         Main.layoutManager.connect('monitors-changed', this._rebuildThumbnails.bind(this));
+
+        this._switchWorkspaceNotifyId = 0;
+        this._nWorkspacesNotifyId = 0;
+        this._syncStackingId = 0;
+        this._workareasChangedId = 0;
     },
 
     _updateSwitcherVisibility() {