bug#32848: 26.1; follow-mode cursor move breaks with frame-resize-pixelwise

[Eli Zaretskii]

> Date: Sat, 29 Sep 2018 16:47:16 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 32848@debbugs.gnu.org, andlind@gmail.com, darkfeline@felesatra.moe
> 
> The changes in xdisp.c are a no-brainer, we already call several Lisp
> functions in several places, and there's infrastructure ready for
> that.

Forgot to tell: I volunteer to write this part, if you agree with the
approach.