tst_QWindow::testInputEvents is flaky in CI

********* Start testing of tst_QWindow *********
Config: Using QtTest library 5.11.0, Qt 5.11.0 (i386-little_endian-ilp32 shared (dynamic) release build; by MSVC 2017)
PASS : tst_QWindow::initTestCase()
PASS : tst_QWindow::create()
PASS : tst_QWindow::setParent()
PASS : tst_QWindow::setVisible()
PASS : tst_QWindow::setVisibleFalseDoesNotCreateWindow()
PASS : tst_QWindow::eventOrderOnShow()
PASS : tst_QWindow::resizeEventAfterResize()
PASS : tst_QWindow::exposeEventOnShrink_QTBUG54040()
PASS : tst_QWindow::mapGlobal()
PASS : tst_QWindow::positioning(default)
PASS : tst_QWindow::positioningDuringMinimized()
PASS : tst_QWindow::childWindowPositioning(create)
PASS : tst_QWindow::childWindowPositioning(show)
PASS : tst_QWindow::childWindowLevel()
PASS : tst_QWindow::platformSurface()
PASS : tst_QWindow::isExposed()
PASS : tst_QWindow::isActive()
FAIL! : tst_QWindow::testInputEvents() Compared values are not the same
Actual (window.mousePressButton): 0
Expected (int(Qt::LeftButton)) : 1
tst_qwindow.cpp(1058) : failure location
PASS : tst_QWindow::touchToMouseTranslation()
PASS : tst_QWindow::touchToMouseTranslationForDevices()
PASS : tst_QWindow::mouseToTouchTranslation()
PASS : tst_QWindow::mouseToTouchLoop()
PASS : tst_QWindow::touchCancel()
PASS : tst_QWindow::touchCancelWithTouchToMouse()
PASS : tst_QWindow::touchInterruptedByPopup()
PASS : tst_QWindow::orientation()
PASS : tst_QWindow::sizes()
PASS : tst_QWindow::close()
PASS : tst_QWindow::activateAndClose()
PASS : tst_QWindow::mouseEventSequence()
PASS : tst_QWindow::windowModality()
PASS : tst_QWindow::inputReentrancy()
PASS : tst_QWindow::tabletEvents()
PASS : tst_QWindow::windowModality_QTBUG27039()
PASS : tst_QWindow::visibility()
PASS : tst_QWindow::mask()
PASS : tst_QWindow::initialSize()
PASS : tst_QWindow::modalDialog()
PASS : tst_QWindow::modalDialogClosingOneOfTwoModal()
PASS : tst_QWindow::modalWithChildWindow()
PASS : tst_QWindow::modalWindowModallity()
PASS : tst_QWindow::modalWindowPosition()
FAIL! : tst_QWindow::modalWindowEnterEventOnHide_QTBUG35109() Compared values are not the same
Actual (((root.enterEventCount))): 0
Expected (1) : 1
tst_qwindow.cpp(2066) : failure location
PASS : tst_QWindow::windowsTransientChildren()
PASS : tst_QWindow::requestUpdate()
PASS : tst_QWindow::stateChange(normal->min->normal)
PASS : tst_QWindow::stateChange(normal->maximized->normal)
PASS : tst_QWindow::stateChange(normal->fullscreen->normal)
PASS : tst_QWindow::stateChange(normal->maximized->fullscreen->normal)
PASS : tst_QWindow::flags()
PASS : tst_QWindow::testBlockingWindowShownAfterModalDialog()
PASS : tst_QWindow::generatedMouseMove()
PASS : tst_QWindow::cleanupTestCase()
Totals: 51 passed, 2 failed, 0 skipped, 0 blacklisted, 19379ms
********* Finished testing of tst_QWindow *********