messageList: Mark NotificationMessageGroup for export

This allows extensions to override `_addNotification()` to create
custom `NotificationMessage` subclasses, which is already possible
for `MessageTray.MessageTray._showNotification()`.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3672>

diff --git a/js/ui/messageList.js b/js/ui/messageList.js
index 8ac1564838bd31393faabcbbb9d97619e8f0eab4..169168c3aef64a8513c6f32efbc2ec05e96ccd36 100644 (file)
--- a/js/ui/messageList.js
+++ b/js/ui/messageList.js
@@ -832,7 +832,7 @@ class MediaMessage extends Message {
     }
 });
 
-const NotificationMessageGroup = GObject.registerClass({
+export const NotificationMessageGroup = GObject.registerClass({
     Properties: {
         'expanded': GObject.ParamSpec.boolean(
             'expanded', null, null,