bug#53322: 28.0.91; "C-h c" errors out for menu-bar clicks

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Cc: 53322@debbugs.gnu.org
> Date: Tue, 18 Jan 2022 20:25:45 +0200
> 
> >   C-h c
> >   Click File->Open File from the menu bar
> >
> > This signals an error:
> >
> >   posn-set-point: Position not in text area of window
> >
> > Same thing happens with "C-h k".
> 
> This is not reproducible, neither in gtk, nor in no-toolkit.

That's expected.  But it is still a problem.

Can you explain the rationale for the change in 8230a47?  I've read
the commit log, but I still don't get it: what exactly is the problem
with running the mouse-leave-buffer-hook in that case?  Also, are
there other reasons for that change?  It was committed together with a
change in isearch.el, so is that related in some way?