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Dmitry Gutov authored
Fixes: debbugs:20290 * doc/emacs/files.texi (Comparing Files): Document the new default value of `diff-switches'. * doc/emacs/trouble.texi (Sending Patches): Document the preference for unified diff format. Escape the plus in the suggested `-F' regexp value. * lisp/vc/diff.el (diff-switches): Change the default to `-u'.
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