[gnome-shell] altTab: use AltTab prefix on AppIcon class

[Florian Müllner <fmuellner src gnome org>]

commit 1687a5451eacb5b2661725ed5ded8582d73c798f
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Fri Apr 19 09:02:00 2019 +0300

    altTab: use AltTab prefix on AppIcon class
    
    There's an AppIcon class on appDisplay, so it won't be easy to discern
    the one we're going to add in altTab.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/700

 js/ui/altTab.js | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/js/ui/altTab.js b/js/ui/altTab.js
index 9d884cef50..55c680877f 100644
--- a/js/ui/altTab.js
+++ b/js/ui/altTab.js
@@ -648,8 +648,9 @@ class WindowCyclerPopup extends CyclerPopup {
     }
 });
 
-var AppIcon = GObject.registerClass(
-class AppIcon extends St.BoxLayout {
+var AppIcon = GObject.registerClass({
+    GTypeName: 'AltTab_AppIcon'
+}, class AppIcon extends St.BoxLayout {
     _init(app) {
         super._init({ style_class: 'alt-tab-app',
                       vertical: true });