bug#13066: 24.2.90; setting rmail-summary-window-size causes error

[Kenichi Handa]

In article <y98v9ahn21.fsf@fencepost.gnu.org>, Glenn Morris <rgm@gnu.org> 
writes:

> > This is also because rmail-maybe-display-summary behaves differently to
> > how it used to.

> I installed a fix for that to emacs-24.

Thank you.  I confirmed the fix.

By the way, it seems that rmail-maybe-display-summary should
use window-resize instead of enlarge-window.  Then we don't
need the extra code for changing and restoring window and
buffer.

---
Kenichi Handa
handa@gnu.org