tests/perf: Add test for shutdown with open window

This would without the applied fix trigger
https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/6536.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2722>

js/js-resources.gresource.xml

@@ -36,6 +36,7 @@
     <file>misc/weather.js</file>
 
     <file>perf/basic.js</file>
+    <file>perf/closeWithActiveWindows.js</file>
     <file>perf/core.js</file>
     <file>perf/headlessStart.js</file>
     <file>perf/hwtest.js</file>

js/perf/closeWithActiveWindows.js

@@ -0,0 +1,29 @@
+// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
+/* exported run */
+/* eslint camelcase: ["error", { properties: "never", allow: ["^script_", "^malloc", "^glx", "^clutter"] }] */
+
+const Main = imports.ui.main;
+const Scripting = imports.ui.scripting;
+
+/** Run test. */
+async function run() {
+    /* eslint-disable no-await-in-loop */
+
+    /* Make created windows remain visible during exit. */
+    Scripting.disableHelperAutoExit();
+
+    Main.overview.hide();
+    await Scripting.waitLeisure();
+    await Scripting.sleep(1000);
+
+    await Scripting.createTestWindow({
+        width: 640,
+        height: 480,
+    });
+
+    await Scripting.waitTestWindows();
+    await Scripting.waitLeisure();
+    await Scripting.sleep(1000);
+
+    /* eslint-enable no-await-in-loop */
+}

tests/meson.build

@@ -39,6 +39,9 @@ perf_tests = [
   {
     'name': 'basic',
   },
+  {
+    'name': 'closeWithActiveWindows',
+  },
   {
     'name': 'headlessStart',
     'options': ['--hotplug'],