NSUndoManager: redo not working

北城余情 提交于 2019-12-04 07:22:00

When the Undo system performs an undo action, it expects you to register the redo actions using the same code as for undo, (except that the NSUndoManager knows it's rewinding - but you should not care).

So add the proper NSUndoManager calls in -setSliderValue:

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