bug#17905: 24.3.50; writing with a giant font triggers RTL text entry

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: holtzermann17@gmail.com,  17905-done@debbugs.gnu.org
> Date: Fri, 04 Jul 2014 10:15:25 -0400
> 
> > subtly break.  E.g., set scroll-margin to a non-zero value, then type
> > "C-x C-+" enough time to enlarge the font significantly, and you will
> > see that Emacs lets point enter the scroll margin (because it
> > internally computes the scroll margin in pixels using the frame's
> > default font).
> 
> I think this is OK: the scroll-margin's unit is "lines" but it is really
> just a proxy for pixels.  Same as for window-margins.

Well, I'm sure someone will be surprised...