[gnome-shell/wip/fmuellner/gtk4: 7/16] extensions-app: Stop using GtkContainer API

[Florian Müllner <fmuellner src gnome org>]

commit 6ff91fad16a2f121acbe8cface8faaf7f1196eab
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Apr 15 20:27:15 2020 +0200

    extensions-app: Stop using GtkContainer API
    
    The interface has been removed in GTK4, so use widget-specific API
    for adding children where possible.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1495

 subprojects/extensions-app/js/main.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/subprojects/extensions-app/js/main.js b/subprojects/extensions-app/js/main.js
index dc993ef966..b7288fac12 100644
--- a/subprojects/extensions-app/js/main.js
+++ b/subprojects/extensions-app/js/main.js
@@ -333,9 +333,9 @@ var ExtensionsWindow = GObject.registerClass({
         row.show_all();
 
         if (row.type === ExtensionType.PER_USER)
-            this._userList.add(row);
+            this._userList.insert(row, -1);
         else
-            this._systemList.add(row);
+            this._systemList.insert(row, -1);
     }
 
     _queueUpdatesCheck() {