diff-minor-mode is a misdesigned extension

[Andreas Schwab]

diff-minor-mode-prefix should not default to "\C-cd".  Quoting from the
Emacs manual (*Note (emacs)Keymaps::.):

   As a user, you can redefine any key; but it might be best to stick to
key sequences that consist of `C-c' followed by a letter.  These keys
are "reserved for users," so they won't conflict with any properly
designed Emacs extension.

Andreas.

-- 
Andreas Schwab                                  "And now for something
SuSE Labs                                        completely different."
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