bug#20365: 24.5; all-completions returns duplicates for Info-read-node-name-1

[Dmitry Gutov <dgutov@yandex.ru>]

On 04/19/2015 08:00 PM, Oleh Krehel wrote:

> No problem: no completion package will complain if you don't pass it duplicates.
> Then it's just a matter of fixing the offening callers of completion one by one.

Good luck with that.

> Actually, 0.08 is a lot when you consider that I would call this after
> each key press (in case when the collection is a function, not for the
> static list).  The sluggishness would be perceptible even for a
> relatively slow typist. And this is only the overhead, there's also
> actual computing to be done. There's no reason not to avoid this
> overhead cost.

It's only 80ms as long as the list is unfiltered. Type one or two chars 
- and the already small delay disappears into nothing.