* log-edit.el (log-edit-show-diff): New function.
(log-edit-mode-map, log-edit-menu): Bind it. (log-edit-diff-function): New variable. (log-edit): Change the 3rd param to be an alist and accept a function that computes a diff for the files involved. * vc.el (vc-log-edit): Add a diff function parameter to log-edit.
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