QmlViewer: Fix assert on exit (Windows)

The QApplication object in main() is already destroyed when showWarnings()
is called. Create another instance in this case.

(Note that the assert will only be triggered for debug builds, while qmlviewer
is built in release mode by default).

Task-number: QTBUG-14009
Reviewed-by: Thomas Hartmann

1 files changed, 3 insertions, 0 deletions

diff --git a/tools/qml/main.cpp b/tools/qml/main.cpp
index 78cd64d..bf183e5 100644
--- a/tools/qml/main.cpp
+++ b/tools/qml/main.cpp
@@ -89,6 +89,9 @@ QString warnings;
 void showWarnings()
 {
     if (!warnings.isEmpty()) {
+        int argc = 0; char **argv = 0;
+        QApplication application(argc, argv); // QApplication() in main has been destroyed already.
+        Q_UNUSED(application)
         QMessageBox::warning(0, QApplication::tr("Qt QML Viewer"), warnings);
     }
 }