Add new user option 'diff-add-log-use-relative-names'

* .dir-locals.el: Set new option to t
* etc/NEWS: Mention new option.
* lisp/vc/diff-mode.el (diff-add-log-use-relative-names): Add new option.
(diff-add-log-current-defuns): Use new option.
* doc/emacs/maintaining.texi (Log Buffer): Mention new option.

1 files changed, 5 insertions, 1 deletions

diff --git a/doc/emacs/maintaining.texi b/doc/emacs/maintaining.texi
index 343cc83ce5d..9f81313844e 100644
--- a/doc/emacs/maintaining.texi
+++ b/doc/emacs/maintaining.texi
@@ -690,11 +690,15 @@ started editing (@pxref{Old Revisions}), type @kbd{C-c C-d}
 
 @kindex C-c C-w @r{(Log Edit mode)}
 @findex log-edit-generate-changelog-from-diff
+@vindex diff-add-log-use-relative-names
   To help generate ChangeLog entries, type @kbd{C-c C-w}
 (@code{log-edit-generate-changelog-from-diff}), to generate skeleton
 ChangeLog entries, listing all changed file and function names based
 on the diff of the VC fileset.  Consecutive entries left empty will be
-combined by @kbd{C-q} (@code{fill-paragraph}).
+combined by @kbd{C-q} (@code{fill-paragraph}).  By default the
+skeleton will just include the file name, without any leading
+directories.  If you wish to prepend the leading directories up to the
+VC root, customize @code{diff-add-log-use-relative-names}.
 
 @kindex C-c C-a @r{(Log Edit mode)}
 @findex log-edit-insert-changelog