Since commit 7ba75d0 we close the QWindow in QWidget::close for native
widgets and trigger the closeEvent in QWidgetWindow. However, if the
widget's window handle is not a top level window, QWindow::close()
will not close the window, failing in this way to deliver the
closeEvent and call the close handling in QWidgetPrivate::handleClose.
To fix, call handleClose() from QWidget::close for such widgets.
Task-number: QTBUG-74606
Pick-to: 6.2
Change-Id: Ied342eced3340aaf19b5443762935b1a5fc5c27b
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
ec09900997