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Halla Rempt authored
This gets rid of both the delayed save dialog in KisMainWindow (which offered a cancel button that didn't work to cancel the runnin strokes), and the locking in KisDocument (which dead-locked Krita and caused dataloss). Instead, a shallow clone of the image is created that can be safely used to save. The strokes will run on the original image, which means that the result of still-running strokes is not saved. The user is warned about that. (That means a new message has been added.)
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