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Richard M. Stallman authored
(undo-copy-list, undo-copy-list-1): New functions. (undo-make-selective-list, undo-delta): New functions. (undo-elt-in-region, undo-elt-crosses-region): New functions. (undo-adjusted-markers): New defvar. (undo-start): New args BEG and END. (undo): If arg or active region, pass args to undo-start.
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