From: Alp Aker <alptekin.aker@gmail.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 18417@debbugs.gnu.org, Dmitry <dgutov@yandex.ru>
Subject: bug#18417: 24.3.93; posn-at-point confused by fill-column-indicator
Date: Sun, 7 Sep 2014 23:11:35 -0400 [thread overview]
Message-ID: <CACxch4rNSrMXZAm9h_AB+p0k+hpAE3+p_RWHV=zyXxM_GEOVKQ@mail.gmail.com> (raw)
In-Reply-To: <837g1fcpm9.fsf@gnu.org>
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> The recipe in effect invokes undefined behavior in posn-at-point,
> because fci-mode uses a zero-length (a.k.a. "empty") overlay to
> place, in a very convoluted way, a stretch of whitespace followed
> by an image, before the newline.
[snip]
> Since the buffer position of the newline is not "covered" by the
> empty overlay, Emacs happily stops when it reaches the newline,
> oblivious to the fact that on the way it produced the stretch
> glyph of a very large width.
I'm not sure it's due to the overlay having zero length. Here's a minimal
recipe that provokes the same behavior using a overlay of length 1
(covering the newline):
(progn
(delete-all-overlays)
(goto-char (point-min))
(insert "\n")
(setq o (make-overlay 1 2)
s (propertize " "
'display '(space :align-to 10)
'cursor t))
(overlay-put o 'before-string s)
(goto-char (point-min))
(setq col (car (posn-col-row (posn-at-point (point)))))
(message (concat "Current column: " (number-to-string col))))
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next prev parent reply other threads:[~2014-09-08 3:11 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-06 9:43 bug#18417: 24.3.93; posn-at-point confused by fill-column-indicator Dmitry
2014-09-07 17:22 ` Eli Zaretskii
2014-09-07 18:55 ` Dmitry Gutov
2014-09-07 19:43 ` Eli Zaretskii
2014-09-07 19:52 ` Alp Aker
2014-09-07 19:56 ` Eli Zaretskii
2014-09-08 3:11 ` Alp Aker [this message]
2014-09-09 14:38 ` Eli Zaretskii
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