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I noticed that when I fold some text with zf and then press u for undo it does not undo the fold but undoes the last text editing action. Is there a general-purpose undo command which also would undo the action of having created some fold? It should be as if the command did not happen, so I can imagine the cursor returning to the end of the highlighted range where it was, for example.

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You don't undo a fold, you open it with zo or delete it with zd (this doesn't delete content, only suppresses the notion that there's a fold there, closable with zc).

In general, try :help followed by the keystroke you've tried to find out more. :help zf leads you to the topic of folds, and these other commands are documented there.

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  • Thanks. I did know that I can undo a fold. I meant that the standard undo command, "u", appears not to apply to the act of folding. Maybe it applies only to editing commands. If folding counts as a motion, maybe there's an "undo last motion" command instead. If there was, you could call it from anywhere rather than having the cursor on the specific fold to undo it; and you could keep calling it to undo various consecutive previous actions, of which a fold was just one.
    – John Smith
    Oct 6 '21 at 13:32
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    Indeed, undo is reverting a change. Folding, saving, pasting,... are not changes and are not in the undo tree - of which you can think of as a git tree of commits, see :help 32.1 and following. A jump motion can be reverted by using the jump history (<kbd>CTRL</kbd>-<kbd>O</kbd>).
    – Joce
    Oct 6 '21 at 14:40

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