When a window is minimized and the About Qt/About application dialog is shown then the window is brought back

When a window is minimized and the About Qt/About application dialog is shown then the window is brought back, however once the dialog is dismissed the window is unresponsive and cannot be interacted with. This is a regression against Qt 4.6.3.

To reproduce this start the application example, minimize the window and then in the application menu click on About Qt or About Application.