ControlsManagerLayout: Use the workarea size to compute the available height

To compute the available height for the layout we're currently using the
panel position, while this works for the current and default setup, the
shell may be configured to use a different workarea, so we should rely on
it to compute the available space, instead of a specific widget.

So get the current monitor index for the current view and use its coordinates
instead.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1892>

diff --git a/js/ui/overviewControls.js b/js/ui/overviewControls.js
index c153161696b80f5b192c8bf028ba1959fca01c8c..df098ace958c6d4b504e7ecce57a959db2e429f8 100644 (file)
--- a/js/ui/overviewControls.js
+++ b/js/ui/overviewControls.js
@@ -131,11 +131,10 @@ class ControlsManagerLayout extends Clutter.BoxLayout {
 
         const { spacing } = this;
 
-        let startY = 0;
-        if (Main.layoutManager.panelBox.y === Main.layoutManager.primaryMonitor.y) {
-            startY = Main.layoutManager.panelBox.height;
-            box.y1 += startY;
-        }
+        const monitor = Main.layoutManager.findMonitorForActor(this._container);
+        const workArea = Main.layoutManager.getWorkAreaForMonitor(monitor.index);
+        const startY = workArea.y - monitor.y;
+        box.y1 += startY;
         const [width, height] = box.get_size();
         let availableHeight = height;