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Ulf Hermann authored
Allow models to be created without a parent and provide default implementations for virtual methods. It's actually fine to have all ranges in row 0 and in black by default. Having default implementations makes things easier to test. Change-Id: Ibb842ef295cdcfa13d8ca4be3489906af72e9699 Reviewed-by: Kai Koehne <kai.koehne@theqtcompany.com>
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