bug#14771: 24.3.50; Unable to scroll one line at time at window edges.

[Eli Zaretskii]

> From: Keith David Bershatsky <esq@lawlist.com>
> Date: Tue, 2 Jul 2013 13:02:08 -0700
> Cc: Eli Zaretskii <eliz@gnu.org>
> 
> Just a follow-up.  The following combination is what breaks scroll-step:
> 
> (setq scroll-step 1)
> (setq-default line-spacing 0.5)
> 
> In prior versions of Emacs Trunk (a month or so ago), it was possible to use 
> (setq-default line-spacing 0.5) without interfering with scroll-step, and I 
> believe that scroll-step previously defaulted to 1 without needing to be set 
> manually.
> 
> The two lines of code are the only ones needed to reproduce the issue on OSX 
> 10.6.8.

As I said, this is a very old bug: we were disregarding line-spacing
when computing the canonical line height in pixels.

Revision 113300 on the development trunk fixes that.  I'm therefore
marking this bug done.

Thanks.