[gnome-shell/gnome-40] boxpointer: Fix positioning with non-widget sources

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

commit 2809b5899da286666fe063abcb28c6db7f0ef82c
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Sep 1 20:37:13 2021 +0200

    boxpointer: Fix positioning with non-widget sources
    
    Commit 16d371873 lifted the requirement for source actors to be
    widgets, then got it wrong :rolling_eyes:
    
    The content box is expected to be in actor coordinates, so the
    allocation must be translated to (0, 0).
    
    https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/4593
    
    (cherry picked from commit 0fd205ce54ccae0129cb2f3a4f8f92d842fe0d51)
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1982>

 js/ui/boxpointer.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/js/ui/boxpointer.js b/js/ui/boxpointer.js
index c7a8f92d01..be9c57ce03 100644
--- a/js/ui/boxpointer.js
+++ b/js/ui/boxpointer.js
@@ -467,7 +467,10 @@ var BoxPointer = GObject.registerClass({
         const sourceAllocation = sourceActor.get_allocation_box();
         const sourceContentBox = sourceActor instanceof St.Widget
             ? sourceActor.get_theme_node().get_content_box(sourceAllocation)
-            : sourceAllocation;
+            : new Clutter.ActorBox({
+                x2: sourceAllocation.get_width(),
+                y2: sourceAllocation.get_height(),
+            });
         let sourceTopLeft = this._sourceExtents.get_top_left();
         let sourceBottomRight = this._sourceExtents.get_bottom_right();
         let sourceCenterX = sourceTopLeft.x + sourceContentBox.x1 + (sourceContentBox.x2 - 
sourceContentBox.x1) * this._sourceAlignment;