bug#12796: Optimize `ido-completing-read' for larger lists with flex matching enabled

[Dmitry Gutov]

On 04.11.2012 17:53, Stefan Monnier wrote:
> > If I decide to type quickly but make a typo in one of the first characters,
> > I often need to wait a few seconds until I can fix the typo or start anew.
>
> `while-no-input' (which AFAICT is used by ido) is supposed to interrupt
> the computation as soon as you type the next input so you don't need
> to wait.
>
> Are you saying that while-no-input doesn't work?

I only see `while-no-input' used in one place there: in 
`ido-make-merged-file-list', and that function is only used in 
`find-file' mode.

So yeah, using it around matching loops in `ido-set-matches-1' might be 
another way to optimize, provided the overhead is not too much.