* diff-mode.el (diff-add-log-file-name, diff-current-defun): New funs.

* diff-mode.el (diff-add-log-file-name, diff-current-defun): New funs.
(diff-mode): Add support for add-log.el.
(diff-hunk-text): Use char offsets rather than line offsets.
(diff-find-source-location): Replace LINE with line-offset (nil
if not found) and always set POS to a meaningful position.
Adapt to the new char-offsets.
(diff-apply-hunk): Drop support for the unused `select' POPUP.
Adapt to the new diff-find-source-location.
(diff-goto-source): Adapt to the new diff-find-source-location.