[gnome-shell] extensions: Allow updating with only extension-manager installed

[Florian Müllner <fmuellner src gnome org>]

commit 789e1b288ae0d74a0b944d8dbedfff46678bea29
Author: Matthew Jakeman <mjakeman26 outlook co nz>
Date:   Fri Jul 1 23:24:08 2022 +1200

    extensions: Allow updating with only extension-manager installed
    
    GNOME Shell will only update extensions if the org.gnome.Extensions
    app is present. This commit adds alternative support for
    com.mattjakeman.ExtensionManager to the extension updating mechanism.
    
    It enables updates to occur when extension-manager is the sole installed
    tool on the system. When both applications are installed,
    org.gnome.Extensions is preferred at all times.
    
    Fixes #5564
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2358>

 js/ui/extensionSystem.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/js/ui/extensionSystem.js b/js/ui/extensionSystem.js
index 20abfcf439..ca96a99f4f 100644
--- a/js/ui/extensionSystem.js
+++ b/js/ui/extensionSystem.js
@@ -65,7 +65,8 @@ var ExtensionManager = class extends Signals.EventEmitter {
 
     get updatesSupported() {
         const appSys = Shell.AppSystem.get_default();
-        return appSys.lookup_app('org.gnome.Extensions.desktop') !== null;
+        return (appSys.lookup_app('org.gnome.Extensions.desktop') !== null) ||
+               (appSys.lookup_app('com.mattjakeman.ExtensionManager.desktop') !== null);
     }
 
     lookup(uuid) {
@@ -663,6 +664,8 @@ class ExtensionUpdateSource extends MessageTray.Source {
     _init() {
         let appSys = Shell.AppSystem.get_default();
         this._app = appSys.lookup_app('org.gnome.Extensions.desktop');
+        if (!this._app)
+            this._app = appSys.lookup_app('com.mattjakeman.ExtensionManager.desktop');
 
         super._init(this._app.get_name());
     }