Introduce Window::closeOnDismissed() flag

This can be used to control the sending of QEvent::Close event.

src/interfaces/window.cpp

@@ -35,6 +35,7 @@ public:
     Window::Layer layer = Window::LayerTop;
     QMargins margins;
     Window::ScreenConfiguration screenConfiguration = Window::ScreenFromQWindow;
+    bool closeOnDismissed = true;
 };
 
 static QMap<QWindow *, Window *> s_map;
@@ -120,6 +121,16 @@ void Window::setScreenConfiguration(Window::ScreenConfiguration screenConfigurat
     d->screenConfiguration = screenConfiguration;
 }
 
+bool Window::closeOnDismissed() const
+{
+    return d->closeOnDismissed;
+}
+
+void Window::setCloseOnDismissed(bool close)
+{
+    d->closeOnDismissed = close;
+}
+
 #if QT_VERSION < QT_VERSION_CHECK(6, 6, 0)
 void Window::attachPopup(QWindow *window, xdg_popup *popup)
 {

src/interfaces/window.h

@@ -97,6 +97,15 @@ public:
     void setScope(const QString &scope);
     QString scope() const;
 
+    /**
+     * Whether the QWindow should be closed when the layer surface is dismissed by the compositor.
+     * For example, if the associated screen has been removed.
+     *
+     * This can be used to map the window on another screen.
+     */
+    void setCloseOnDismissed(bool close);
+    bool closeOnDismissed() const;
+
     /**
      * Gets the LayerShell Window for a given Qt Window
      * Ownership is not transferred