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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 ...

    www.emacswiki.org/emacs/UndoTree
  2. 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 ...

    www.emacswiki.org/emacs/CategoryUndo
  3. 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 ...

    www.emacswiki.org/emacs/UndoCommands
  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 ...

    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 ...

    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 ...

    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 ...

    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 ...

    www.emacswiki.org/emacs/UndoFilling
  10. EmacsWiki: Redo Plus
    Oct 12, 2013 ... redo.el provides a linear undo/redo system which is easy to understand for many
    people. However, redo.el is out-of-date and often destroys the ...

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


 

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