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

[Eli Zaretskii]

> Date: Sun, 30 Sep 2018 14:09:21 +0000
> Cc: 32848@debbugs.gnu.org, andlind@gmail.com, darkfeline@felesatra.moe
> From: Alan Mackenzie <acm@muc.de>
> 
> The problem was that LH point was "straddling" the window "edge".  The
> solution appears to be to copy what happens when LH point is outside the
> window, i.e. allow redisplay to move it back to the centre of the window.
> 
> For this, a simple (forward-line) suffices.
> 
> The trouble is, all the make-cursor-line-fully-visible stuff we've done
> then becomes redundant, since point will never be left inside a partially
> displayed line, except possibly at EOB.
> 
> Here's my current patch.  What do you think?

I think we should revert the change to set
make-cursor-line-fully-visible locally on the emacs-26 branch, and
install this patch instead.  But on master, I think we need both this
patch and a special function that sets make-cursor-line-fully-visible
nil in non-last windows under follow-mode, because that's definitely
what follow-mode wants.

WDYT?