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

[E Sabof]

On Sun, Jun 16, 2013 at 5:35 PM, Eli Zaretskii <eliz@gnu.org> wrote:

> Date: Sun, 16 Jun 2013 16:24:43 +0100
> From: E Sabof <esabof@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.

I have also tried

(progn (pos-visible-in-window-p)

       (window-line-height))

but it didn't seem to make any difference.