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emacs-27 03093ba: diff-no-select doc string clarification

From: Lars Ingebrigtsen
Subject: emacs-27 03093ba: diff-no-select doc string clarification
Date: Sat, 12 Sep 2020 07:08:45 -0400 (EDT)

branch: emacs-27
commit 03093baf9093c0e855915da5085d272b11588a75
Author: Lars Ingebrigtsen <larsi@gnus.org>
Commit: Lars Ingebrigtsen <larsi@gnus.org>

    diff-no-select doc string clarification
    * lisp/vc/diff.el (diff-no-select): Update doc string from the trunk,
    don't merge.
 lisp/vc/diff.el | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/lisp/vc/diff.el b/lisp/vc/diff.el
index 9e7e771..4698880 100644
--- a/lisp/vc/diff.el
+++ b/lisp/vc/diff.el
@@ -145,9 +145,17 @@ Possible values are:
 (defun diff-no-select (old new &optional switches no-async buf)
   ;; Noninteractive helper for creating and reverting diff buffers
-  "Compare the OLD and NEW file/buffer, and return a diff buffer.
+  "Compare the OLD and NEW file/buffer.
+If the optional SWITCHES is nil, the switches specified in the
+variable ‘diff-switches’ are passed to the diff command,
+otherwise SWITCHES is used.  SWITCHES can be a string or a list
+of strings.
-See `diff' for the meaning of the arguments."
+If NO-ASYNC is non-nil, call diff synchronously.
+By default, this function creates the diff in the \"*Diff*\"
+buffer.  If BUF is non-nil, BUF is used instead.  This function
+returns the buffer used."
   (unless (bufferp new) (setq new (expand-file-name new)))
   (unless (bufferp old) (setq old (expand-file-name old)))
   (or switches (setq switches diff-switches)) ; If not specified, use default.

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