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Agata Cacko authored
Summary: Before Quick Brush engine (roundmarker) was crashing because Sequential Iterator throwed out asserts when the rectangle was not "empty" according to Qt but still not valid (for example has intmin value on width or height). This commit fixes that behaviour by providing additional checks. Commit includes also benchmarks for roundmarker. BUG:404179 Test Plan: - benchmarks included in the commit - painting with Quick Brush (i.e. b) Basic-1) with size <1 px Reviewers: dkazakov, #krita Reviewed By: dkazakov, #krita Subscribers: rempt Tags: #krita Differential Revision: https://phabricator.kde.org/D19881
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