Showing, hiding, and showing a window can result in the Xcb QPA plugin
warning about
qt.qpa.xcb: internal error: void QXcbWindow::setNetWmStateOnUnmappedWindow()
called on mapped window
The point of the test is to verify that we get a paint event on a window
that is shown again after having been hidden, not to verify that async
windowing systems can handle a show/hide/show sequence. So wait for the
window being exposed before we hide it.
Pick-to: 6.2 5.15
Change-Id: If91a9926613645e78e332dacff34bd57e4034b6f
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
3714e51436