[gnome-shell-extensions/gnome-3-38] window-list: Account for monitor offset in window previews

[Florian Müllner <fmuellner src gnome org>]

commit 37f03f5e2ec652eb48b14f6ec1b483fc40f9fe6f
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Oct 21 20:22:32 2020 +0200

    window-list: Account for monitor offset in window previews
    
    Windows' frame rects are in screen coordinates, while the workspace
    thumbnails are based on the monitor work area. Unless we account
    for the difference, previews end up mispositioned in multi-monitor
    setups.
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell-extensions/-/merge_requests/142>
    
    (cherry picked from commit 893d3b0473f5ff24e25c2cdb21bfea968b134f6a)

 extensions/window-list/workspaceIndicator.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/extensions/window-list/workspaceIndicator.js b/extensions/window-list/workspaceIndicator.js
index 698cc9d..3dbfb0c 100644
--- a/extensions/window-list/workspaceIndicator.js
+++ b/extensions/window-list/workspaceIndicator.js
@@ -91,8 +91,8 @@ class WorkspaceLayout extends Clutter.LayoutManager {
                 Math.round(Math.min(frameRect.width, workArea.width) * hscale),
                 Math.round(Math.min(frameRect.height, workArea.height) * vscale));
             childBox.set_origin(
-                Math.round(frameRect.x * hscale),
-                Math.round(frameRect.y * vscale));
+                Math.round((frameRect.x - workArea.x) * hscale),
+                Math.round((frameRect.y - workArea.y)  * vscale));
             child.allocate(childBox);
         }
     }