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The auto of the brush tool does not seem to be in relation with the problem described as it is a setting to activate automatic mask border in course of brushing. As you indicate, most likely, is that you have activated a shortcut, and we will probably never know what it is. Well, with everything back to normal, it's not too bad. However, if it happens ...


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The standard Undo and Redo keyboard shortcuts (Ctrl-Z and Ctrl-Y on Windows and Linux, CMD-Z and CMD-shift-Z on Apple) operate in Darktable - at least, they do running in Ubuntu : I haven't checked the other OSs. More Darktable shortcuts here. If you're looking for a way to view the image with and without a specific module effect, each module has a "power ...


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