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Fix integer overflow for broken QPainterPaths

Andreas Sturmlechner requested to merge asturmlechner/qtbase:QTBUG-100217 into kde/5.15

With some bogus input, we can end up with NaN in the bounding rects of the control points. This in turn causes problems later when it is converted to ints and used in code. To avoid it, we exit early if the rect is invalid (negative or NaN size).

Pick-to: 5.15 6.2 6.3 Fixes: QTBUG-100217 Change-Id: Idbc6700b85cb30198d69fedbf8f3be3e1ab65e40 Reviewed-by: Lars Knoll lars.knoll@qt.io (cherry picked from commit d6c4a3ed)

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