Don't give focus to a frame when clicking outside a focused child

Closes https://github.com/wxWidgets/wxWidgets/pull/1238

src/qt/frame.cpp

@@ -242,4 +242,5 @@ wxQtMainWindow::wxQtMainWindow( wxWindow *parent, wxFrame *handler )
 wxQtCentralWidget::wxQtCentralWidget( wxWindow *parent, wxFrame *handler )
     : wxQtEventSignalHandler< QScrollArea, wxFrame >( parent, handler )
 {
+    setFocusPolicy(Qt::NoFocus);
 }