bug#29279: Sharing the margins

[Eli Zaretskii]

> Date: Wed, 15 Nov 2017 19:51:50 +0100
> From: martin rudalics <rudalics@gmx.at>
> CC: 29279@debbugs.gnu.org, joostkremers@fastmail.fm
> 
> I intend to drop most calls of 'window-configuration-change-hook' and
> replace them by 'window-size-change-functions' if all they do is to
> change the sizes of windows only.

Regardless of the reasons for this change, it doesn't affect the issue
at hand: calling window-size-change-functions from inside redisplay
has the same issues as calling window-configuration-change-hook.