From: Eli Zaretskii <eliz@gnu.org>
To: Shingo Tanaka <shingo.fg8@gmail.com>
Cc: 48149@debbugs.gnu.org
Subject: bug#48149: 27.2; Wrong underline width when the line char has a width of 2
Date: Sun, 02 May 2021 10:17:53 +0300 [thread overview]
Message-ID: <837dkh8uzi.fsf__22492.4155323365$1619940077$gmane$org@gnu.org> (raw)
In-Reply-To: <87fsz62b1w.wl-shingo.fg8@gmail.com> (message from Shingo Tanaka on Sun, 02 May 2021 10:12:43 +0900)
> Date: Sun, 02 May 2021 10:12:43 +0900
> From: Shingo Tanaka <shingo.fg8@gmail.com>
>
> When exporting org-mode document to plain text (either ascii/unicode/utf-8)
> with `org-export-dispatch', Emacs inserts lines under headlines, inline
> tasks, table rows and titles of the document, TOC, list of listings, list of
> tables and footnotes. The problem is it inserts too long (double width) line
> when the line character has a width of 2.
>
> Those lines are made of 3 types of characters below (in ox-ascii.el):
> 1) org-ascii-underline
> 2) (if (eq (plist-get info :ascii-charset) 'utf-8) ?─ ?_)
> 3) (if utf8p ?━ ?_)
>
> In case of 1), it correctly takes account of the case in which the character
> has a width of 2 in `org-ascii--build-title', by dividing the line width by
> `(char-width under-char)' (line 700-701), maybe because the character is user
> configurable and its width in unknown. However, in case of 2) and
> 3), maybe because the characters is embedded in the code, it looks like only
> considering the character always has a width of 1. But the reality is
> character ?─ or ?━ can have a width of 2 in the screen displayed with some
> fonts (ex. "Noto Sans Mono CJK JP"), and in that case the line width gets
> doubled of the expected width.
>
> Attached one is a potential patch. The basic concepts are:
>
> a) Do the same in case of 2) and 3) as in case of 1)
> (dividing the line width by `(char-width under-char)',
> assuming `char-width-table' is correctly set)
>
> b) Prefer the longer line width if the width is odd, even in case of 1)
> (adding `(1- (char-width under-char))' to dividend,
> just because it should be more beautiful ;-) )
You reported a similar bug already, and I replied there that TRT in
these cases is to use window-text-pixel-size, which will automatically
account for the actual width on display of any characters and any
fonts specified for displaying them. char-width is an approximation,
and is accurate only on TTY frames.
next prev parent reply other threads:[~2021-05-02 7:17 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-02 1:12 bug#48149: 27.2; Wrong underline width when the line char has a width of 2 Shingo Tanaka
2021-05-02 7:17 ` Eli Zaretskii
2021-05-02 7:17 ` Eli Zaretskii [this message]
2021-05-02 8:36 ` Rudolf Schlatte
2021-05-02 9:16 ` Eli Zaretskii
2021-05-02 16:08 ` Nicolas Goaziou
2021-05-02 16:23 ` Eli Zaretskii
2021-05-09 13:57 ` Shingo Tanaka
2021-05-02 16:23 ` Eli Zaretskii
2021-05-02 16:08 ` Nicolas Goaziou
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='837dkh8uzi.fsf__22492.4155323365$1619940077$gmane$org@gnu.org' \
--to=eliz@gnu.org \
--cc=48149@debbugs.gnu.org \
--cc=shingo.fg8@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.