DropEvent is not generated without moveing mouse manually.

i am try to create the test case for my application.  Qdrag::exec() is funcation not return unless I move mouse manully on GUI.

I have mention full code detail in 

https://forum.qt.io/topic/148759/what-is-wrong-with-testcase-for-drag-and-drop-funcationality

Simila bug report i found but here the Drag and Drop is on same widget. In my application Drag started from widget 1 and Drop in widget 2.

https://bugreports.qt.io/browse/QTBUG-34331

https://codereview.qt-project.org/c/qt/qtbase/+/228418/19/tests/auto/widgets/kernel/qwidget_window/tst_qwidget_window.cpp