WindowClone: Fix interaction with multiple monitors (#2406)

Author: lenemter

data/gala.metainfo.xml.in

@@ -27,6 +27,18 @@
   <update_contact>contact_at_elementary.io</update_contact>
 
   <releases>
+    <release version="8.2.3" date="2025-05-20" urgency="medium">
+      <description>
+        <p>Improvements:</p>
+          <ul>
+          <li>Updated translations</li>
+        </ul>
+      </description>
+      <issues>
+        <issue url="https://github.com/elementary/gala/issues/2400">Switching workspaces makes the windows move down with multiple monitors</issue>
+      </issues>
+    </release>
+  
     <release version="8.2.2" date="2025-05-17" urgency="medium">
       <description>
         <p>Improvements:</p>

src/Widgets/MultitaskingView/WindowClone.vala

@@ -245,9 +245,10 @@ public class Gala.WindowClone : ActorTarget, RootTarget {
         }
 
         var window_rect = window.get_frame_rect ();
+        var monitor_geometry = window.display.get_monitor_geometry (window.get_monitor ());
 
-        add_target (new PropertyTarget (MULTITASKING_VIEW, this, "x", typeof (float), (float) window_rect.x, (float) slot.x));
-        add_target (new PropertyTarget (MULTITASKING_VIEW, this, "y", typeof (float), (float) window_rect.y, (float) slot.y));
+        add_target (new PropertyTarget (MULTITASKING_VIEW, this, "x", typeof (float), (float) (window_rect.x - monitor_geometry.x), (float) slot.x));
+        add_target (new PropertyTarget (MULTITASKING_VIEW, this, "y", typeof (float), (float) (window_rect.y - monitor_geometry.y), (float) slot.y));
         add_target (new PropertyTarget (MULTITASKING_VIEW, this, "width", typeof (float), (float) window_rect.width, (float) slot.width));
         add_target (new PropertyTarget (MULTITASKING_VIEW, this, "height", typeof (float), (float) window_rect.height, (float) slot.height));
         add_target (new PropertyTarget (MULTITASKING_VIEW, this, "shadow-opacity", typeof (uint8), (uint8) 0u, (uint8) 255u));