tests: make xembed/qt-client-widget better

See also QX11EmbedWidget::QX11EmbedWidget() in src/gui/kernel/qx11embed_x11.cpp in qt4.

https: //github.com/qt/qt/blob/4.8/src/gui/kernel/qx11embed_x11.cpp#L475-L477

Pick-to: 6.4 6.3 6.2 5.15
Change-Id: I47504a2d8f3e33c367f092d01ee5d7e1b16b5106
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

2 files changed, 5 insertions, 1 deletions

diff --git a/tests/manual/xembed/qt-client-widget/main.cpp b/tests/manual/xembed/qt-client-widget/main.cpp
index 59b1a76c6a..7451d7bb1e 100644
--- a/tests/manual/xembed/qt-client-widget/main.cpp
+++ b/tests/manual/xembed/qt-client-widget/main.cpp
@@ -21,12 +21,12 @@ int main(int argc, char *argv[])
     }
 
     Window window;
-    window.show();
 
     QWindow *foreign = QWindow::fromWinId(winId);
     Q_ASSERT(foreign != 0);
 
     window.windowHandle()->setParent(foreign);
+    window.show();
 
     return app.exec();
 }
diff --git a/tests/manual/xembed/qt-client-widget/window.cpp b/tests/manual/xembed/qt-client-widget/window.cpp
index d485c92b14..6f0a373ec3 100644
--- a/tests/manual/xembed/qt-client-widget/window.cpp
+++ b/tests/manual/xembed/qt-client-widget/window.cpp
@@ -7,6 +7,10 @@
 
 Window::Window()
 {
+    setAttribute(Qt::WA_NativeWindow);
+    setAttribute(Qt::WA_DontCreateNativeAncestors);
+    createWinId();
+
     QGroupBox *echoGroup = new QGroupBox(tr("Echo"));
 
     QLabel *echoLabel = new QLabel(tr("Mode:"));