Add option to auto-refresh the lossage buffer. (Bug#79732)

* lisp/help.el (view-lossage-auto-refresh): New user option.
(help--lossage-update): New variable.
(help--lossage-make-recent-keys, help--refresh-lossage-buffer):
New functions.
(view-lossage): Rework.
* doc/emacs/help.texi (Misc Help):
* etc/NEWS: Document change.

1 files changed, 8 insertions, 2 deletions

diff --git a/doc/emacs/help.texi b/doc/emacs/help.texi
index 6ea7b5783c2..879967ddfb2 100644
--- a/doc/emacs/help.texi
+++ b/doc/emacs/help.texi
@@ -716,8 +716,14 @@ use @kbd{C-h l} (@code{view-lossage}).  @kbd{C-h l} displays your last
 input keystrokes and the commands they invoked.  By default, Emacs
 stores the last 300 keystrokes; if you wish, you can change this number with
 the command @code{lossage-size}.
-If you see commands that you are not familiar with, you can use @kbd{C-h k} or
-@kbd{C-h f} to find out what they do.
+If you see commands that you are not familiar with, use
+@kbd{C-h k}, or press @kbd{RET} or click on them to find out what they do.
+
+@vindex view-lossage-auto-refresh
+By default, after the lossage buffer is displayed it will not show the
+most recent keystroke and command that you are currently typing, to
+change this set the variable @code{view-lossage-auto-refresh} to
+@code{t}.
 
 @kindex C-h e
 @findex view-echo-area-messages