[Interest] QBackingStore::endPaint dumps lots of warnings in software mode

[Manner Róbert]

Hi,

When I run an example/default qml project I get a lot of warnings about
active painters:

> QT_QUICK_BACKEND="software" ./example

QBackingStore::endPaint() called with active painter on backingstore paint
device
QBackingStore::endPaint() called with active painter on backingstore paint
device

This happens on pretty latest archlinux (Qt 5.10.1), and I am quite sure it
was not the case with Qt 5.9.

Do you know about this issue? Is it harmless? Do you think it is worth a
bugreport?

Br,

Robert
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