bug#57212: 29.0.50; [PATCH] Citizen's arrest of end-of-defun-moves-to-eol

[Gregory Heytings]

> > > If you're convinced narrowing within a critical section of redisplay 
> > > is safe (and I suspect it is), do it all the time, not just when 
> > > "long_line_optimizations_p" is true.
> >
> > That might indeed be what Emacs could do in the long term, once we have 
> > enough experience with it.
>
> No, it shouldn't, because of the adverse effects of that on some aspects 
> of the Emacs behavior.

Indeed.  I should have added something like "if we find a way to cope with 
these adverse effects".