[gnome-shell] workspaceThumbnail: Update visibility when showing the overview

[Marge Bot <marge-bot src gnome org>]

commit 7a57528bd7940e68c404d15d398f88730821cec9
Author: Jonas Dreßler <verdre v0yd nl>
Date:   Thu Mar 4 08:14:03 2021 +0100

    workspaceThumbnail: Update visibility when showing the overview
    
    There's currently a bug that we continue showing the workspace minimap
    when the number of workspaces changes back to 1 during the session (ie.
    outside the overview). Fix that by also updating the workspaceThumbnails
    visibility when entering the overview.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/3819
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1741>

 js/ui/workspaceThumbnail.js | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/js/ui/workspaceThumbnail.js b/js/ui/workspaceThumbnail.js
index 79c8df2249..cf03756a55 100644
--- a/js/ui/workspaceThumbnail.js
+++ b/js/ui/workspaceThumbnail.js
@@ -1018,6 +1018,8 @@ var ThumbnailsBox = GObject.registerClass({
             this._stateCounts[ThumbnailState[key]] = 0;
 
         this.addThumbnails(0, workspaceManager.n_workspaces);
+
+        this._updateShouldShow();
     }
 
     _destroyThumbnails() {