fix(overlay): Linux X11/XWayland stacking, stale pause state, multi-copy selector (#101)

src/main/runtime/settings-window-z-order.test.ts

@@ -1,6 +1,9 @@
 import assert from 'node:assert/strict';
 import test from 'node:test';
-import { shouldSuppressVisibleOverlayRaiseForSeparateWindow } from './settings-window-z-order';
+import {
+  hasLiveSeparateWindow,
+  shouldSuppressVisibleOverlayRaiseForSeparateWindow,
+} from './settings-window-z-order';
 
 test('separate settings windows suppress visible overlay restacking', () => {
   const mainWindow = { id: 'overlay', isDestroyed: () => false };
@@ -38,3 +41,20 @@ test('separate settings windows do not suppress unrelated or closed overlay work
     false,
   );
 });
+
+test('live separate window detection ignores hidden and destroyed windows', () => {
+  assert.equal(
+    hasLiveSeparateWindow([
+      { isDestroyed: () => false, isVisible: () => false },
+      { isDestroyed: () => true, isVisible: () => true },
+    ]),
+    false,
+  );
+  assert.equal(
+    hasLiveSeparateWindow([
+      { isDestroyed: () => false, isVisible: () => false },
+      { isDestroyed: () => false, isVisible: () => true },
+    ]),
+    true,
+  );
+});