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Fix rare integer overflow in text shaping

Andreas Sturmlechner requested to merge asturmlechner/qtbase:QTBUG-91758 into kde/5.15

With extreme painter scaling, linearAdvance may be too large to fit in an unsigned short.

Fixes: QTBUG-91758 Pick-to: 6.1 5.15 Change-Id: I7bbe6e77ec9bcef4aa5259da1d3000ed1a8eb27a Reviewed-by: Eskil Abrahamsen Blomfeldt eskil.abrahamsen-blomfeldt@qt.io (cherry picked from commit e2bdff35)

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