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For HighDPI, it is necessary to set the join style. We need MiterJoin in order not to have a rectangle which has two corners rounded. This should not have any effect on non-HighDPI systems. Change-Id: I6e5898c2424cf6f313c45982571b8b0c9940458b Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>
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