New command 'diff-buffers'

* lisp/vc/diff.el (diff-buffers): New command.
(diff, diff-no-select, diff-file-local-copy): Improve docstrings.
* doc/emacs/files.texi:
* etc/NEWS: Document new command, and the previously-undocumented
ability for 'diff' to compare buffers.

1 files changed, 4 insertions, 0 deletions

diff --git a/doc/emacs/files.texi b/doc/emacs/files.texi
index c3ede1833b5..7221edcc1b2 100644
--- a/doc/emacs/files.texi
+++ b/doc/emacs/files.texi
@@ -1394,6 +1394,10 @@ backup of.  In all other respects, this behaves like @kbd{M-x diff}.
 buffer with its corresponding file.  This shows you what changes you
 would make to the file if you save the buffer.
 
+@findex diff-buffers
+  The command @kbd{M-x diff-buffers} compares the contents of two
+specified buffers.
+
 @findex compare-windows
   The command @kbd{M-x compare-windows} compares the text in the
 current window with that in the window that was the selected window