Windows: tst_QMdiArea::tabBetweenSubWindows() is flaky

test(s): C:/Users/qt/work/qt/qtbase/tests/auto/widgets/widgets/qmdiarea:
c:\Users\qt\work\testresults\tests\auto\widgets\widgets\qmdiarea600809181,xml -o -,txt
 ********* Start testing of tst_QMdiArea *********
 Config: Using QtTest library 5.9.0, Qt 5.9.0 (x86_64-little_endian-llp64 shared (dynamic) release build; by MSVC 2013)
 PASS   : tst_QMdiArea::initTestCase()
 PASS   : tst_QMdiArea::subWindowActivated(data0)
 PASS   : tst_QMdiArea::subWindowActivated(data1)
 PASS   : tst_QMdiArea::subWindowActivated(data2)
 PASS   : tst_QMdiArea::subWindowActivated2()
 PASS   : tst_QMdiArea::subWindowActivatedWithMinimize()
 PASS   : tst_QMdiArea::showWindows()
 PASS   : tst_QMdiArea::changeWindowTitle()
 PASS   : tst_QMdiArea::changeModified()
 PASS   : tst_QMdiArea::childSize()
 PASS   : tst_QMdiArea::fixedSize()
 PASS   : tst_QMdiArea::minimumSizeHint()
 PASS   : tst_QMdiArea::sizeHint()
 PASS   : tst_QMdiArea::setActiveSubWindow()
 PASS   : tst_QMdiArea::activeSubWindow()
 PASS   : tst_QMdiArea::currentSubWindow()
 PASS   : tst_QMdiArea::addAndRemoveWindows()
 PASS   : tst_QMdiArea::addAndRemoveWindowsWithReparenting()
 PASS   : tst_QMdiArea::removeSubWindow_2()
 PASS   : tst_QMdiArea::closeWindows()
 PASS   : tst_QMdiArea::activateNextAndPreviousWindow()
 PASS   : tst_QMdiArea::subWindowList(CreationOrder)
 PASS   : tst_QMdiArea::subWindowList(StackingOrder)
 PASS   : tst_QMdiArea::subWindowList(ActivationHistoryOrder)
 PASS   : tst_QMdiArea::setBackground()
 PASS   : tst_QMdiArea::setViewport()
 QWARN  : tst_QMdiArea::tileSubWindows() QWindowsWindow::setGeometry: Unable to set geometry 1802x392+340+140 on QWidgetWindow/'QMdiAreaClassWindow'. Resulting geometry:  1284x392+340+140 (frame: 8, 31, 8, 8, custom margin: 0, 0, 0, 0, minimum size: 0x0, maximum size: 16777215x16777215).
 QWARN  : tst_QMdiArea::tileSubWindows() QWindowsWindow::setGeometry: Unable to set geometry 1819x409+340+140 on QWidgetWindow/'QMdiAreaClassWindow'. Resulting geometry:  1284x409+340+140 (frame: 8, 31, 8, 8, custom margin: 0, 0, 0, 0, minimum size: 0x0, maximum size: 16777215x16777215).
 PASS   : tst_QMdiArea::tileSubWindows()
 PASS   : tst_QMdiArea::cascadeAndTileSubWindows()
 QWARN  : tst_QMdiArea::resizeMaximizedChildWindows(multiple children) QWindowsWindow::setGeometry: Unable to set geometry 100x30+320+140 on QWidgetWindow/'QWidgetClassWindow'. Resulting geometry:  124x30+320+140 (frame: 8, 31, 8, 8, custom margin: 0, 0, 0, 0, minimum size: 0x0, maximum size: 16777215x16777215).
 PASS   : tst_QMdiArea::resizeMaximizedChildWindows(multiple children)
 PASS   : tst_QMdiArea::focusWidgetAfterAddSubWindow()
 PASS   : tst_QMdiArea::dontMaximizeSubWindowOnActivation()
 PASS   : tst_QMdiArea::delayedPlacement()
 PASS   : tst_QMdiArea::iconGeometryInMenuBar()
 PASS   : tst_QMdiArea::resizeTimer()
 PASS   : tst_QMdiArea::updateScrollBars()
 PASS   : tst_QMdiArea::setActivationOrder(CreationOrder)
 PASS   : tst_QMdiArea::setActivationOrder(StackingOrder)
 PASS   : tst_QMdiArea::setActivationOrder(ActivationHistoryOrder)
 QWARN  : tst_QMdiArea::tabBetweenSubWindows() Rubber band has different geometry
 FAIL!  : tst_QMdiArea::tabBetweenSubWindows() 'tabBetweenSubWindowsIn(&mdiArea)' returned FALSE. ()
 tst_qmdiarea.cpp(2271) : failure location
 PASS   : tst_QMdiArea::setViewMode()
 PASS   : tst_QMdiArea::setTabsClosable()
 Totals: 50 passed, 1 failed, 0 skipped, 0 blacklisted, 12560ms
 ********* Finished testing of tst_QMdiArea *********