bug#9034: point adjustment (with invisible text) moves to the next line

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: dmitry.kurochkin@gmail.com,  9034@debbugs.gnu.org
> Date: Thu, 26 Aug 2021 19:05:15 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > I cannot reproduce this: no matter how many times I do the "C-e M-:"
> > dance, point stays put.
> 
> Does it help if you only do the `C-e' once?

I tried that as well, to no avail.

I think a more efficient way of understanding what's going on with M-:
is to step through the code in keyboard.c with a debugger.