bug#12619: completion-at-point and changing buffer

[Jorgen Schaefer]

On Tue, 23 Oct 2012 23:19:21 -0400
Stefan Monnier <monnier@iro.umontreal.ca> wrote:

> I've just installed a patch which should solve those problems.
> Can you confirm it fixes your case?

I'm afraid it doesn't (tested with trunk/110646). The problem is that
`minibuffer-force-complete' uses `field-beginning' and `field-end',
neither of which returns a marker. So even if the original function
uses markers, at this point they are turned into absolute buffer
positions.

Wrapping both calls in `copy-marker' fixes the problem for me.

Regards,
        -- Jorgen