Re: fix for bug#29935 copyright-update inserts year at random places

[Stephen Leake <stephen_leake@stephe-leake.org>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Stephen Leake <stephen_leake@stephe-leake.org>
>> Date: Mon, 08 Jan 2018 10:56:59 -0600
>> 
>> This thread is nominally about patching emacs-26 to fix a bug. The patch
>> I've posted is a minimal fix; adding code or redesigning to handle frames
>> better is feature-creep, so it should be done on master.
>
> I think the bug happens because we use save-window-excursion, and
> switch buffers inside it.  The cure should be not to do what hurts.
> Can this be done in this case?  If not, why not?  And why do we use
> save-window-excursion in the first place? that's not the usual way to
> display a buffer whose contents is referenced in an error message or a
> prompt.

I posted an update on debbugs, giving a recipe for reproducing the bug,
and giving the results of various suggested fixes.

I tried deleting save-window-excursion; that does not fix the bug.

I don't have a rationale for the current design of the function, but I
think redesigning it should be done on master, not emacs-26.

-- 
-- Stephe