Add auto-revert-buffer-in-progress-p

* doc/lispref/backups.texi (Reverting):
Add auto-revert-buffer-in-progress-p.

* etc/NEWS: Mention auto-revert-buffer-in-progress-p.

* lisp/autorevert.el (auto-revert-buffer-in-progress-p):
New autoloaded variable.
(auto-revert-buffer): Let-bind it.  (Bug#79145)

* lisp/dired-x.el (dired-omit-expunge): Suppress messages when in
auto-revert.

1 files changed, 7 insertions, 0 deletions

diff --git a/doc/lispref/backups.texi b/doc/lispref/backups.texi
index f3f0902f364..a1df26230aa 100644
--- a/doc/lispref/backups.texi
+++ b/doc/lispref/backups.texi
@@ -852,6 +852,13 @@ It is important to assure that point does not continuously jump around
 as a consequence of auto-reverting.  Of course, moving point might be
 inevitable if the buffer radically changes.
 
+@defvar auto-revert-buffer-in-progress-p
+@code{auto-revert-buffer} binds this variable to a non-@code{nil} value
+while it is working.  This can be used by major mode
+@code{revert-buffer-function} implementations to suppress messages in
+Auto Revert modes, for example.
+@end defvar
+
 @defvar inhibit-auto-revert-buffers
 When the current buffer is member of this variable (a list of buffers),
 auto-reverting is suppressed for that buffer.  This is useful if serious