Check actual contents before promting about changed file

* lisp/userlock.el (userlock--check-content-unchanged)
(userlock--ask-user-about-supersession-threat): New functions.
* src/filelock.c (lock_file): Use them to avoid spurious prompting.
* doc/lispref/buffers.texi (Modification Time): Update doc of
ask-user-about-supersession-threat.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/filelock.c b/src/filelock.c
index 2f92e0fdc83..bde34e2c6c2 100644
--- a/src/filelock.c
+++ b/src/filelock.c
@@ -684,7 +684,7 @@ lock_file (Lisp_Object fn)
     if (!NILP (subject_buf)
         && NILP (Fverify_visited_file_modtime (subject_buf))
         && !NILP (Ffile_exists_p (fn)))
-      call1 (intern ("ask-user-about-supersession-threat"), fn);
+      call1 (intern ("userlock--ask-user-about-supersession-threat"), fn);
 
   }