tests: skip tst_QGuiApplication::topLevelAt() on Wayland

This amends 189f9873ae .

Pick-to: 6.7 6.6 6.5
Fixes: QTBUG-121015
Change-Id: I66d2a2b0162b9c7b488af840ff5d3a881b657782
Reviewed-by: David Edmundson <davidedmundson@kde.org>

tests/auto/gui/kernel/qguiapplication/tst_qguiapplication.cpp

@@ -1329,6 +1329,9 @@ void tst_QGuiApplication::topLevelAt()
     char *argv[] = { const_cast<char*>("tst_qguiapplication") };
     QGuiApplication app(argc, argv);
 
+    if (QGuiApplication::platformName().startsWith(QLatin1String("wayland"), Qt::CaseInsensitive))
+        QSKIP("QGuiApplication::topLevelAt() is not Wayland compliant, see also QTBUG-121015");
+
     QWindow bottom;
     bottom.setObjectName("Bottom");
     bottom.setFlag(Qt::FramelessWindowHint);