[OS X]: Mouse move events are not received by a widget if it is shown with the mouse over it until it reenters the widget

[OS X]: Mouse move events are not received by a widget if it is shown with the mouse over it until it reenters the widget. Attached is an example which reproduces the problem, click on the button and then move over the tablewidget, note that there is no debug output. Move out of it and then back again and it works fine.