[gnome-shell] ibusCandidatePopup: Use plain actor as dummy cursor

[Marge Bot <marge-bot src gnome org>]

commit f51fb4bed05faaf9ad38889ffd972ef374cd29f7
Author: Florian Müllner <fmuellner gnome org>
Date:   Tue Jun 29 21:17:27 2021 +0200

    ibusCandidatePopup: Use plain actor as dummy cursor
    
    Now that source actors no longer have to be widgets, we can use
    a plain actor for the dummy cursor and save a bit of overhead.
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1903>

 js/ui/ibusCandidatePopup.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/js/ui/ibusCandidatePopup.js b/js/ui/ibusCandidatePopup.js
index 6c497b2e93..5a9fe77928 100644
--- a/js/ui/ibusCandidatePopup.js
+++ b/js/ui/ibusCandidatePopup.js
@@ -146,7 +146,7 @@ class IbusCandidatePopup extends BoxPointer.BoxPointer {
         this.visible = false;
         this.style_class = 'candidate-popup-boxpointer';
 
-        this._dummyCursor = new St.Widget({ opacity: 0 });
+        this._dummyCursor = new Clutter.Actor({ opacity: 0 });
         Main.layoutManager.uiGroup.add_actor(this._dummyCursor);
 
         Main.layoutManager.addChrome(this);