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Volker Hilsheimer e2b3d42f94 Don't divide by zero when calculating number of items
Amends e74af68654.

If the model has children, then row 0 should have a non-zero size, but
it's not unthinkable that a delegate returns zero for size hint, so
protect against that case.

Task-number: QTBUG-87588
Pick-to: 5.15
Change-Id: Ia396f532d42ce5fad8757d629816c3cdc31d84ed
Reviewed-by: Jan Arve Sæther <jan-arve.saether@qt.io>
Reviewed-by: Doris Verria <doris.verria@qt.io>
Reviewed-by: Florian Bruhin <qt-project.org@the-compiler.org>
2020-10-16 13:53:03 +02:00
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