From: martin rudalics <rudalics@gmx.at>
To: Andreas Politz <politza@hochschule-trier.de>, 24804@debbugs.gnu.org
Subject: bug#24804: 25.1; posn-at-point erroneously signals an error
Date: Thu, 27 Oct 2016 19:35:55 +0200 [thread overview]
Message-ID: <58123AFB.201@gmx.at> (raw)
In-Reply-To: <87k2cudhgg.fsf@hochschule-trier.de>
> The documentation of the function posn-at-point states
>
> "Return nil if position is not visible in window.",
>
> but it may also signal an error in this case. This happens, if
> Fpos_visible_in_window_p returns a list of (X Y RTOP RBOT ROWH VPOS)
> and at least Y is negative (which indicates, that pos is not visible
> IIUC). The error is then signaled by Fposn_at_x_y, which only accpets
> non-negative numbers (neglecting the exceptional case of -1 for X).
>
> I think this function should include a similar test for y, as is already
> in place for x, returning nil if it is negative (see below).
Thanks. But according to Eli the problem is in Fpos_visible_in_window_p
which should never return a negative y in the first place.
> Reproducing this state may be a little bit tricky, anyway evaluate the
> following lines, starting with `emacs -Q'.
>
> (defvar img "foo.png");; The image should be taller then the window
> ;; it's displayed in.
> (setq debug-on-error t)
> (find-file img)
> (redisplay t) ;; If in batch mode.
> (image-scroll-up 999)
> ;; The image should be scrolled to the bottom now, while point equals 1.
> (posn-at-point (point-max) (selected-window))
That's a valuable information. I indeed can reproduce the problem with
this scenario (but only on another machine where I can display images
and the Emacs there must be repaired). Could you try answering the
question Eli asked for bug#23809 namely:
. Can you show the entire value returned by Fpos_visible_in_window_p
when its call from Fposn_at_point returns, when this problem is
reproduced?
Thanks again, martin
next prev parent reply other threads:[~2016-10-27 17:35 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-26 19:43 bug#24804: 25.1; posn-at-point erroneously signals an error Andreas Politz
[not found] ` <handler.24804.B.147751104225420.ack@debbugs.gnu.org>
2016-10-26 19:49 ` bug#24804: Acknowledgement (25.1; posn-at-point erroneously signals an error) Andreas Politz
2016-10-27 17:35 ` martin rudalics [this message]
2016-10-27 18:26 ` bug#24804: 25.1; posn-at-point erroneously signals an error Andreas Politz
2016-10-28 8:12 ` Eli Zaretskii
2016-10-29 10:23 ` Eli Zaretskii
2016-10-29 14:26 ` Andreas Politz
2016-10-29 14:36 ` Eli Zaretskii
2016-10-29 14:42 ` Eli Zaretskii
2016-10-29 20:33 ` Andreas Politz
2016-10-29 22:03 ` Eli Zaretskii
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