wayland: Dismiss XdgPopupWindow when the parent window is closed

XdgPopupWindow can't exist on its own.

BUG: 472013

autotests/integration/xdgshellwindow_test.cpp

@@ -107,6 +107,7 @@ private Q_SLOTS:
     void testModal();
     void testCloseModal();
     void testCloseInactiveModal();
+    void testClosePopupOnParentUnmapped();
 };
 
 void TestXdgShellWindow::testXdgPopupReactive_data()
@@ -2322,5 +2323,29 @@ void TestXdgShellWindow::testCloseInactiveModal()
     QCOMPARE(workspace()->activeWindow(), otherWindow);
 }
 
+void TestXdgShellWindow::testClosePopupOnParentUnmapped()
+{
+    // This test verifies that a popup window will be closed when the parent window is closed.
+
+    std::unique_ptr<KWayland::Client::Surface> parentSurface = Test::createSurface();
+    std::unique_ptr<Test::XdgToplevel> parentToplevel = Test::createXdgToplevelSurface(parentSurface.get());
+    Window *parent = Test::renderAndWaitForShown(parentSurface.get(), QSize(200, 200), Qt::cyan);
+    QVERIFY(parent);
+
+    std::unique_ptr<Test::XdgPositioner> positioner = Test::createXdgPositioner();
+    positioner->set_size(10, 10);
+    positioner->set_anchor_rect(10, 10, 10, 10);
+
+    std::unique_ptr<KWayland::Client::Surface> childSurface = Test::createSurface();
+    std::unique_ptr<Test::XdgPopup> popup = Test::createXdgPopupSurface(childSurface.get(), parentToplevel->xdgSurface(), positioner.get());
+    Window *child = Test::renderAndWaitForShown(childSurface.get(), QSize(10, 10), Qt::cyan);
+    QVERIFY(child);
+
+    QSignalSpy childClosedSpy(child, &Window::closed);
+    parentToplevel.reset();
+    parentSurface.reset();
+    QVERIFY(childClosedSpy.wait());
+}
+
 WAYLANDTEST_MAIN(TestXdgShellWindow)
 #include "xdgshellwindow_test.moc"

src/workspace.cpp

@@ -464,16 +464,13 @@ Workspace::~Workspace()
 #endif
 
     if (waylandServer()) {
-        const QList<Window *> waylandWindows = waylandServer()->windows();
-        for (Window *window : waylandWindows) {
-            window->destroyWindow();
+        while (!waylandServer()->windows().isEmpty()) {
+            waylandServer()->windows()[0]->destroyWindow();
         }
     }
 
-    // We need a shadow copy because windows get removed as we go through them.
-    const QList<Window *> windows = m_windows;
-    for (Window *window : windows) {
-        window->destroyWindow();
+    while (!m_windows.isEmpty()) {
+        m_windows[0]->destroyWindow();
     }
 
     m_rulebook.reset();

src/xdgshellwindow.cpp

@@ -1672,6 +1672,8 @@ void XdgPopupWindow::handleRoleDestroyed()
 {
     disconnect(transientFor(), &Window::frameGeometryChanged,
                this, &XdgPopupWindow::relayout);
+    disconnect(transientFor(), &Window::closed,
+               this, &XdgPopupWindow::destroyWindow);
     m_shellSurface->disconnect(this);
 
     XdgSurfaceWindow::handleRoleDestroyed();
@@ -1815,6 +1817,7 @@ void XdgPopupWindow::initialize()
 
     updateRelativePlacement();
     connect(parent, &Window::frameGeometryChanged, this, &XdgPopupWindow::relayout);
+    connect(parent, &Window::closed, this, &XdgPopupWindow::destroyWindow);
 
     workspace()->placement()->place(this, QRectF());
     scheduleConfigure();