The vast majority is due to leaking styles in a data-driven
test with almost 100 rows (scrollBarRanges()).
Fix by creating the style into a QScopedPointer.
The remaining ~500 leaks were due to leaked QGraphicsScenes.
They had no parent, and QGraphicsView::addScene() does not
adopt them.
Fix those by passing the resp. view as their (QObject) parent.
Change-Id: I4316798019114ea3d7504d72cd83d534a21149c0
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
f6498fd677