* diff-mode.el (diff-mode-shared-map): fset'd and doc change.
(diff-minor-mode, diff-minor-mode-prefix, diff-minor-mode-map): New code to support the minor mode version. (diff-recenter): New function. (diff-next-hunk, diff-next-file): Use it. (diff-remembered-files-alist): New var. (diff-merge-strings): New function. (diff-find-file-name): Make it smarter and use the user's input more. (diff-mode): Cosmetic changes.
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