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

[Eli Zaretskii]

> Date: Mon, 15 Oct 2018 09:23:41 +0000
> Cc: 32848@debbugs.gnu.org, andlind@gmail.com, darkfeline@felesatra.moe
> From: Alan Mackenzie <acm@muc.de>
> 
> > Did you try a buffer whose first line is very tall, taller than the
> > window?
> 
> I've tried a few ways of getting such a window, but without luck.  Emacs
> is very good at making sure a window is no smaller than one line tall.
> ;-)
> 
> Is it possible to create such a line in a window, probably with lisp?

It's possible and even very easy.  Here's one way:

  emacs -Q
  C-x 2
  C-u 12 M-x shrink-window RET
  C-x C-+ + + + + + ....

Continue pressing "+" until the cursor becomes taller than the window,
and you are done.

Another way is to insert a tall image and see what happens with that.

> Or was your question more a prompt to me to handle this unlikely
> situation gracefully?

It was a good-faith question, this stuff always needs to be tested in
such extreme situations.