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QDial: don't crash when min==max and setting a value != min & max

QDial::bound() is crashing when min == max due to a division by zero. Therefore check for this condition beforehand and return min.

Pick-to: 6.6 6.5 6.2 5.15 Fixes: QTBUG-104641 Change-Id: I612625af1ad18333d59a7771abfdec602301b58e Reviewed-by: Axel Spoerl (cherry picked from commit e4315204)

Note: 5.15 codereview not even submitted yet pending now upstream, but cherry-pick is straightforward. See also:

Edited by Andreas Sturmlechner

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