From: Eli Zaretskii <eliz@gnu.org>
To: Dima Kogan <dima@secretsauce.net>
Cc: 61196@debbugs.gnu.org
Subject: bug#61196: 30.0.50; X11 rendering of horizontal line in log-edit mode fails with some fonts
Date: Tue, 31 Jan 2023 19:44:04 +0200 [thread overview]
Message-ID: <83wn521twb.fsf@gnu.org> (raw)
In-Reply-To: <877cx3xg24.fsf@secretsauce.net> (message from Dima Kogan on Tue, 31 Jan 2023 00:29:39 -0800)
> From: Dima Kogan <dima@secretsauce.net>
> Date: Tue, 31 Jan 2023 00:29:39 -0800
>
> Hi. I'm using a bleeding-edge build of emacs from git, but this
> particular issue I've been seeing for maybe 6 months now, or maybe even
> a year.
>
> I'm using a GTK build of Emacs running on X11 on GNU/Linux. Some of that
> is significant.
>
> I can tickle the bug by selecting a particular font, entering
> log-edit-mode, and entering some text:
>
> rm /tmp/xxx;
>
> emacs -Q -geometry 40x8 \
> --eval "(progn (setf (alist-get 'font default-frame-alist) \"-adobe-courier-medium-r-*-*-12-*-*-*-*-*-iso8859-*\")
> (require 'log-edit)
> (find-file \"/tmp/xxx\")
> (log-edit-mode)
> (insert \"a:b\\n\\nc d\"))"
>
> The result looks like the attached 12.png. Note the unrendered 000A
> character block. This is a bug. It should be rendering a horizontal line
> instead. And if I select a different font, it does work. I can do that
> by changing the "-12-" in the above command to "-22-". The result is
> attached in 22.png.
>
> I see it in the wild all the time when making version control commits in
> emacs, and typing the commit message.
Looks like some subtle issue with font selection. Can you bisect?
Initial investigation seems to indicate that this started happening
sometime in last August, but I could be mistaken, as what I see here
is not exactly what you see (I don't have that font installed).
In general, this is what happens in Emacs when some face fails to find
a suitable font for a GUI frame. Then we fall back to the "glyphless"
display method.
next prev parent reply other threads:[~2023-01-31 17:44 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-31 8:29 bug#61196: 30.0.50; X11 rendering of horizontal line in log-edit mode fails with some fonts Dima Kogan
2023-01-31 17:44 ` Eli Zaretskii [this message]
2023-01-31 18:52 ` Dima Kogan
2023-02-01 1:29 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-02-01 3:37 ` Eli Zaretskii
2023-02-01 3:42 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-02-01 12:19 ` Eli Zaretskii
2023-02-01 10:44 ` Gregory Heytings
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