From: Eli Zaretskii <email@example.com> To: Shingo Tanaka <firstname.lastname@example.org> Cc: email@example.com 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: <firstname.lastname@example.org> (raw) In-Reply-To: <email@example.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 <firstname.lastname@example.org> > > 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 parent reply other threads:[~2021-05-02 7:19 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <email@example.com> 2021-05-02 7:17 ` Eli Zaretskii [this message] [not found] ` <firstname.lastname@example.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 2021-05-09 13:57 ` Shingo Tanaka
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