[gnome-shell] extensions-app: Add quit action

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 8d43deaad5ea3d9c945101a4a4d2c1483d047e07
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Oct 28 21:42:48 2020 +0100

    extensions-app: Add quit action
    
    It's good practice to support the standard <ctrl>-q shortcut, so
    add a corresponding action and set its accel accordingly.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/3335

 subprojects/extensions-app/js/main.js | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/subprojects/extensions-app/js/main.js b/subprojects/extensions-app/js/main.js
index aae5b9bfad..2e8b01804b 100644
--- a/subprojects/extensions-app/js/main.js
+++ b/subprojects/extensions-app/js/main.js
@@ -67,6 +67,12 @@ class Application extends Gtk.Application {
             provider,
             Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION);
 
+        const action = new Gio.SimpleAction({ name: 'quit' });
+        action.connect('activate', () => this._window.close());
+        this.add_action(action);
+
+        this.set_accels_for_action('app.quit', ['<Primary>q']);
+
         this._shellProxy = new GnomeShellProxy(Gio.DBus.session,
             'org.gnome.Shell.Extensions', '/org/gnome/Shell/Extensions');