Re: Proper use of `deactivate-mark'?

[Barry Margolin <barmar@alum.mit.edu>]

In article <mailman.14992.1392314356.10748.help-gnu-emacs@gnu.org>,
 Thorsten Jolitz <tjolitz@gmail.com> wrote:

> Stefan Monnier <monnier@iro.umontreal.ca> writes:
> 
> >> Isn't that the appropriate use of `deactivate-mark'?
> >
> > Sounds right, yes.
> >
> >> How can I make sure that no mark is active anymore when I'm done in
> >> buffer B and switch back to buffer A?
> >
> > Not sure why the mark is re-activated.  Could be because you call
> > deactivate-mark from with a save-excursion.
> 
> Not really, but I found the culprit:
> 
> Inside the (and ...) deactivate-mark does not do its work properly (does
> copy-to-register return nil?)
> 
>   ,-------------------------------------------------------
>   | (and
>   |  (use-region-p)
>   |  (copy-to-register ?s (region-beginning) (region-end))
>   |  (deactivate-mark) )
>   `-------------------------------------------------------
> 
> but refactored like this the mark is actually deactivated:
> 
>   ,---------------------------------------------------------
>   | (and
>   |  (use-region-p)
>   |  (copy-to-register ?s (region-beginning) (region-end)) )
>   | (deactivate-mark)
>   `---------------------------------------------------------

Maybe it should be:

(and 
  (use-region-p)
  (progn
    (copy-to-register ?s (region-beginning) (region0end))
    (deactivate-mark)))

-- 
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
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