--- Begin Message ---
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Subject: |
28.0.50; Dozens of spurious markers in buffer-undo-list |
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Date: |
Wed, 03 Mar 2021 23:45:29 +0100 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
Hello,
after using `undo', `buffer-undo-list' often contains entries
referencing several or dozens of markers (seemingly unrelated to
overlays or such; I dunno from where they originate). I know this
happens in current Emacs master, and I also found the problem in the
27.1 coming with Debian testing, build from 2020-11-08. I tried in X.
I measure the count of different marker objects in a buffer's
`buffer-undo-list' with this function:
#+begin_src emacs-lisp
(defun count-markers-in-buffer-undo-list ()
"Message number of (different) markers in `buffer-undo-list'."
(interactive)
(require 'cl-lib)
(message "%d" (length
(cl-delete-duplicates
(seq-filter #'markerp (flatten-tree (copy-tree
buffer-undo-list)))
:test #'eq))))
#+end_src
To reproduce the problem, open a fresh emacs -Q, and in *scratch*,
something like this should do it:
"C-5 C-0 a, RET, C-SPC, C-p, C-SPC, C-n, M-w,
C-y, C-y, C-y";
this recipe is by Yuan Fu, who first reported the problem in emacs-help,
and who is CC'd. Then he calls the above command and gets a number much
larger than 1.
I can reproduce the problem without copy-and-paste, I just hold down the
"a" key and insert some random space chars in between, then undo
everything. Sometimes I need to repeat once or twice to get a number
larger than "1", but very soon I see numbers like "40" which definitely
look pathological. For me the appearance of the issue seems to behave a
bit randomly.
Thanks in advance,
Michael.
In GNU Emacs 28.0.50 (build 6, x86_64-pc-linux-gnu, GTK+ Version 3.24.24, cairo
version 1.16.0)
of 2021-03-03 built on drachen
Repository revision: b28b8d83ac882415555fe02b73a26542c9fca781
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12010000
System Description: Debian GNU/Linux bullseye/sid
Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LCMS2 LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG RSVG SOUND
THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM GTK3 ZLIB
Important settings:
value of $LC_ALL: de_DE.utf8
value of $LC_COLLATE: C
value of $LC_TIME: C
value of $LANG: de_DE.utf8
locale-coding-system: utf-8-unix
--- End Message ---
--- Begin Message ---
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Subject: |
Re: bug#46908: 28.0.50; Dozens of spurious markers in buffer-undo-list |
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Date: |
Mon, 20 Jun 2022 15:56:43 +0200 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) |
Lars Ingebrigtsen <larsi@gnus.org> writes:
> > Giving that a large, but still limited number of copies of the
> > mark marker is stored in the mark rings, that amount of markers isn't a
> > surprise, and if the number is not constantly growing,
> > everything...works as expected so far I think. Correct?
>
> I just lightly skimmed this thread, but does this mean that there's
> nothing to fix here?
Not unlikely.
Ok, let's close this one, I don't think this will lead to
something.
Michael.
--- End Message ---