bug#2042: Ido-mode : filtering does not keep ordering

[Chong Yidong <cyd@gnu.org>]

Leo <sdl.web@gmail.com> writes:

> The existing code gives different precedence to different match type:
>
>  full-matches > suffix matches > prefix matches > remaining matches
>
> For example in switching buffers in ido:
>
> input: ab
>
> Buffer: ab[c]{abcd | abc | xabcd | xabc}
>
> now when the user types c, it changes to:
>
> Buffer: abc{abc | abcd | xabcd | xabc}
>
> Note the different ordering of "abcd" and "abc". Because typing is so
> much quicker than observing the new order, one usually mis-chooses a
> match.

Thanks.  I guess since at least two users of ido have complained about
this behavior, and no one else has chimed in, we can go ahead and make
this change after the release.