It tested whether a paint event was received when calling QWidget::repaint()
right after QWidget::show() without waiting for the window to be exposed.
This caused a QEvent::UpdateRequest to be sent, which ended up in
QWidgetBackingStore::sync() which returns after checking
QWidgetBackingStore::discardSyncRequest(), since Qt::WA_Mapped is not set
on the non-exposed widget.
The test passed on Windows since it contains one call to
QCoreApplication::processEvents() which causes the the initial WM_PAINT
message to be processed in QWindowsWindow::handleWmPaint() which calls
QWindowSystemInterface::flushWindowSystemEvents() and causes Qt::WA_Mapped
to be set. This seems counter to the intention of the test.
Remove the test since it won't pass anymore in Qt 5 unless Qt::WA_Mapped is set.
Task-number: QTBUG-26424
Task-number: QTBUG-38327
Task-number: QTBUG-39842
Change-Id: Iede026d52825dcf1f2e9014a316d26d260309214
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
23bed9f820