GNU bug report logs - #14636
24.3.50.1; window-line-height doesn't seem to work, unless the point is at the end-of-buffer

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: E Sabof <esabof <at> gmail.com>
Subject: bug#14636: closed (Re: bug#14636: 24.3.50.1; window-line-height
 doesn't seem to work, unless the point is at the	end-of-buffer)
Date: Sun, 16 Jun 2013 16:37:02 +0000

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Your bug report

#14636: 24.3.50.1; window-line-height doesn't seem to work, unless the point is at the end-of-buffer

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 14636 <at> debbugs.gnu.org.

-- 
14636: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=14636
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Eli Zaretskii <eliz <at> gnu.org>
To: E Sabof <esabof <at> gmail.com>
Cc: 14636-done <at> debbugs.gnu.org
Subject: Re: bug#14636: 24.3.50.1;
 window-line-height doesn't seem to work, unless the point is at
 the	end-of-buffer
Date: Sun, 16 Jun 2013 19:35:13 +0300

> Date: Sun, 16 Jun 2013 16:24:43 +0100
> From: E Sabof <esabof <at> gmail.com>
> 
> In emacs -Q
> 
> (window-line-height)
> C-o
> C-x C-e
> 
> Results in nil.

That's a documented limitation.  From the doc string:

  Return nil if window display is not up-to-date.  In that case, use
  `pos-visible-in-window-p' to obtain the information.

> Interestingly enough, I can specify line numbers (or not) and it will work,
> but only as long as (= (point) (point-max))

You cannot easily predict when the window display will be up-to-date
by the time this function runs.

Closing as not-a-bug.

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From: E Sabof <esabof <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3.50.1; window-line-height doesn't seem to work, unless the point
 is at the end-of-buffer
Date: Sun, 16 Jun 2013 16:24:43 +0100

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In emacs -Q

(window-line-height)
C-o
C-x C-e

Results in nil.

Interestingly enough, I can specify line numbers (or not) and it will work,
but only as long as (= (point) (point-max))

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