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Fixes the random failure of the command "krita test.kra --export --export-filename test.png" on Windows OS caused by try_lock() failing on the document image file. The genesis of the fix can be found here: https://krita-artists.org/t/krita-api-commandline-interface/23128 It is a simple timing based fix (QThread::msleep(2);). A logic based fix might be more desirable.
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