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

src/core/utils/electron-backend.test.ts

@@ -0,0 +1,34 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { shouldForceX11ElectronBackend } from './electron-backend';
+
+function withPlatform(platform: NodeJS.Platform, run: () => void): void {
+  const original = Object.getOwnPropertyDescriptor(process, 'platform');
+  Object.defineProperty(process, 'platform', { configurable: true, value: platform });
+  try {
+    run();
+  } finally {
+    if (original) Object.defineProperty(process, 'platform', original);
+  }
+}
+
+test('shouldForceX11ElectronBackend forces X11 on Linux except Hyprland/Sway', () => {
+  withPlatform('linux', () => {
+    assert.equal(shouldForceX11ElectronBackend({ XDG_CURRENT_DESKTOP: 'KDE' }), true);
+    assert.equal(shouldForceX11ElectronBackend({ WAYLAND_DISPLAY: 'wayland-0' }), true);
+    // Even an explicit Wayland hint is overridden to x11 on unsupported compositors.
+    assert.equal(shouldForceX11ElectronBackend({ ELECTRON_OZONE_PLATFORM_HINT: 'wayland' }), true);
+    // Hyprland/Sway keep native Wayland (guard reports explicit wayland hints elsewhere).
+    assert.equal(shouldForceX11ElectronBackend({ HYPRLAND_INSTANCE_SIGNATURE: 'hypr' }), false);
+    assert.equal(shouldForceX11ElectronBackend({ SWAYSOCK: '/tmp/sway.sock' }), false);
+  });
+});
+
+test('shouldForceX11ElectronBackend is false off Linux', () => {
+  withPlatform('darwin', () => {
+    assert.equal(shouldForceX11ElectronBackend({ XDG_CURRENT_DESKTOP: 'KDE' }), false);
+  });
+  withPlatform('win32', () => {
+    assert.equal(shouldForceX11ElectronBackend({}), false);
+  });
+});