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From: Eli Zaretskii <eliz@gnu.org>
To: Nicolas Goaziou <mail@nicolasgoaziou.fr>
Cc: shingo.fg8@gmail.com, 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 19:23:02 +0300	[thread overview]
Message-ID: <83im416r6h.fsf@gnu.org> (raw)
In-Reply-To: <87a6pd86el.fsf@nicolasgoaziou.fr> (message from Nicolas Goaziou on Sun, 02 May 2021 18:08:50 +0200)

> From: Nicolas Goaziou <mail@nicolasgoaziou.fr>
> Date: Sun, 02 May 2021 18:08:50 +0200
> Cc: 48149@debbugs.gnu.org
> > 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 ;-) )
> Thank you. This looks good. I cannot apply it on "maint" branch,
> however. Also, a proper commit message would be nice. Could you send an
> updated patch?

Please note that using char-width cannot solve the problem of a
character whose width depends on the font, because char-width is
oblivious to fonts, it only knows about the character's codepoint.

  reply	other threads:[~2021-05-02 16:43 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <87fsz62b1w.wl-shingo.fg8@gmail.com>
2021-05-02  7:17 ` bug#48149: 27.2; Wrong underline width when the line char has a width of 2 Eli Zaretskii
     [not found] ` <837dkh8uzi.fsf__22492.4155323365$1619940077$gmane$org@gnu.org>
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 [this message]
2021-05-09 13:57     ` Shingo Tanaka

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