[gnome-shell] unlockDialog: Turn mainBox into an St.Widget

[Florian Müllner <fmuellner src gnome org>]

commit c52fd9373ca10ea94713e2766b101adcf384d198
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Feb 19 17:15:48 2020 +0100

    unlockDialog: Turn mainBox into an St.Widget
    
    This is the container that contains the elements that are interesting
    for keynav, so it must be aware of focus-chain and -navigation.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/issues/2210

 js/ui/unlockDialog.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/js/ui/unlockDialog.js b/js/ui/unlockDialog.js
index 29f24e5b5f..f894709ffc 100644
--- a/js/ui/unlockDialog.js
+++ b/js/ui/unlockDialog.js
@@ -568,7 +568,7 @@ var UnlockDialog = GObject.registerClass({
             this._otherUserButton, 'visible', Gio.SettingsBindFlags.GET);
 
         // Main Box
-        let mainBox = new Clutter.Actor();
+        let mainBox = new St.Widget();
         mainBox.add_constraint(new Layout.MonitorConstraint({ primary: true }));
         mainBox.add_child(this._stack);
         mainBox.add_child(this._notificationsBox);