[gnome-shell] altTab: Don't fade out thumbnails on destroy

[Florian Müllner <fmuellner src gnome org>]

commit 51b7eb7a2b93f7a13440b95712152f5ca335927d
Author: Jonas Dreßler <verdre v0yd nl>
Date:   Mon Jan 27 23:42:28 2020 +0100

    altTab: Don't fade out thumbnails on destroy
    
    The thumbnails actor `this._thumbnails` has already been destroyed when
    calling `_destroyThumbnails()` from the `destroy` signal handler because
    it is a child actor of the AppSwitcherPopup. So stop destroying the
    thumbnails separately (fading them out inside a destroy handler wouldn't
    make sense anyway).
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/167

 js/ui/altTab.js | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)
---
diff --git a/js/ui/altTab.js b/js/ui/altTab.js
index 35d991e208..94b80f7920 100644
--- a/js/ui/altTab.js
+++ b/js/ui/altTab.js
@@ -280,12 +280,10 @@ class AppSwitcherPopup extends SwitcherPopup.SwitcherPopup {
     }
 
     _onDestroy() {
-        super._onDestroy();
-
-        if (this._thumbnails)
-            this._destroyThumbnails();
         if (this._thumbnailTimeoutId != 0)
             GLib.source_remove(this._thumbnailTimeoutId);
+
+        super._onDestroy();
     }
 
     /**