bug#21869: [Patch] Redisplay: after echo area diminishes in size, Follow Mode windows aren't resynchronised.

[Eli Zaretskii]

> Date: Mon, 9 Nov 2015 19:42:00 +0000
> From: Alan Mackenzie <acm@muc.de>
> Cc: 21869@debbugs.gnu.org, Pip Cet <pipcet@gmail.com>
> 
> > Probably bug#830 and bug#21333.
> 
> > Pip are you still alive?  Have your papers arrived?
> 
> Here's a proposed fix.  It seems to work.  Do you think there are any
> problems with it?

We had a patch in bug #21333 which was discussed and tested at
length.  Please see if it works for your use case as well.  If not,
please tell why not.

Thanks.