tst_QWidget_window::setWindowState is flaky

********* Start testing of tst_QWidget_window *********
Config: Using QtTest library 5.11.0, Qt 5.11.0 (x86_64-little_endian-lp64 shared (dynamic) release build; by GCC 5.3.1 20160406 (Red Hat 5.3.1-6))
PASS   : tst_QWidget_window::initTestCase()
PASS   : tst_QWidget_window::setWindowState(0)
PASS   : tst_QWidget_window::setWindowState(Qt::WindowMaximized)
FAIL!  : tst_QWidget_window::setWindowState(Qt::WindowMinimized) Compared values are not the same
   Actual   (w.windowState())            : WindowNoState
   Expected (state | Qt::WindowMinimized): WindowMinimized
   Loc: [tst_qwidget_window.cpp(915)]
PASS   : tst_QWidget_window::setWindowState(Qt::WindowFullScreen)
PASS   : tst_QWidget_window::cleanupTestCase()
Totals: 5 passed, 1 failed, 0 skipped, 0 blacklisted, 719ms
********* Finished testing of tst_QWidget_window *********