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  1. EmacsWiki: Undo Tree
    Jan 17, 2016 ... About. Emacs's undo system allows you to recover any past state of a buffer. To
    do this, Emacs treats “undo” itself as just another editing action ...

    https://www.emacswiki.org/emacs/UndoTree
  2. EmacsWiki: Undo Commands
    Sep 11, 2015 ... Consecutive repetitions of 'C-/' (or its aliases) undo earlier and earlier changes in
    the current buffer. If all the recorded changes have already ...

    https://www.emacswiki.org/emacs/UndoCommands
  3. EmacsWiki: Category Undo
    May 15, 2013 ... In Emacs, undo means undoing changes to buffers. However, this page includes
    discussion of related ways to “undo” other aspects of your ...

    https://www.emacswiki.org/emacs/CategoryUndo
  4. EmacsWiki: point-undo.el
    May 4, 2010 ... M-x toggle-debug-on-error or (setq debug-on-error t) ;; 3) Use Lisp version
    instead of compiled one: (load "point-undo.el") ;; 4) Do it! ;; 5) If you ...

    https://www.emacswiki.org/emacs/point-undo.el
  5. EmacsWiki: Revert Buffer
    Aug 27, 2014 ... Until Emacs 24.4, there is no way to save the undo history if the file is changed
    behind Emacs's back. Emacs needs to re-read the file from disk ...

    https://www.emacswiki.org/emacs/RevertBuffer
  6. EmacsWiki: Emacs Newbie Key Reference
    Dec 29, 2015 ... You've undone all changes when the mode line shows '--' instead of '**'; redo:
    after undo, C-g and then C-x u; undo unsaved changes to a ...

    https://www.emacswiki.org/emacs/EmacsNewbieKeyReference
  7. EmacsWiki: Selective Undo
    Sep 5, 2008 ... Found this on http://c2.com/cgi-bin/wiki?EmacsRules: Selective Undo. Select an
    area of text, then press C-u C-_ (undo with a prefix argument).

    https://www.emacswiki.org/emacs/SelectiveUndo
  8. EmacsWiki: old-fashioned-undo.el
    Nov 19, 2010 ... This behavior may ;; make undo/redo operations perfect, but I feel this behavior is
    ;; too much verbose and little bit annoying. ;; ;; The undo/redo ...

    https://www.emacswiki.org/emacs/old-fashioned-undo.el
  9. EmacsWiki: Undo Filling
    Sep 5, 2008 ... The simplest thing is to set the fill-column to 9999 or something like that, and then
    use M-q to fill the paragraph, and M-n to move to the next ...

    https://www.emacswiki.org/emacs/UndoFilling
  10. EmacsWiki: Redo Mode
    Mar 13, 2011 ... Emacs treats 'undo' as just another command. Therefore you can undo the undo.
    This is powerful and confusing, because if you are doing ...

    https://www.emacswiki.org/emacs/RedoMode


 

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