Redo stands for a command that reverses the undo or advances the buffer to a more current state.

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Why are the “Undo” and “Redo” arrow icons commonly round?

A simple Google Image search will show a lot of icons related to "Undo & Redo", and interestingly, most of them, if not all are round. Take a look at the ones Microsoft Office uses: And some ...
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Time based undo/redo?

A friend of mine works on a tool allowing visually presenting ideas and she asked me how it should let users go back to any changes made previously. Firstly, I told her to just provide History and ...