Counting absolute paint events is fragile, as there are no guarantees
that a single call to QApp::processEvents only delivers a single paint
event to a widget. As of QTBUG-76566, we see that the items occasionally
receive three calls to paint, which can be simulated by activating other
windows while the test is running and waiting for events to be
processed.
Instead, verify that we do receive any paint events as the first test,
and then verify increments when we expect updates.
This also reverts change 24b9424adc.
Change-Id: Ib51853e918f31acd3aea10d4109c95f34012a29f
Fixes: QTBUG-76566
Reviewed-by: Dimitrios Apostolou <dimitrios.apostolou@qt.io>
Reviewed-by: Andreas Aardal Hanssen <andreas@hanssen.name>
b426cff1e0