Warn about potential abuse of QQuickPaintedItem::paint().
Warn about potential abuse of QQuickPaintedItem::paint().

Change-Id: I9908402b3ada90497070930d43eafd433276201f
Reviewed-by: Samuel Rødal <99126055f8d73e4355b075213322026fa8c060bd@digia.com>
Reviewed-by: J-P Nurmi <b84a892f57a298bb5dae653b4e188948a84d5549@digia.com>

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