RE: buffer name completion is case-sensitive now

[Drew Adams]

> >> With the introduction of `read-file-name-completion-ignore-case'  
> >> there's less need to have an MS-Windows specific
> >> default value of `completion-ignore-case'.
> >
> > Irrelevant. This is about completion of _buffer_ names, not 
> > file names. Try completing `*m' to *Messages* now - doesn't work.
> >
> > No one is questioning what `read-file-name' should do; this is about
> > `completing-read' with buffer names.
> 
> Emacs has always been case-sensitive by default on most platforms.

My bad; I mistakenly thought that was not the case. 

I used to use Emacs on UNIX a lot, and I still use it sometimes on GNU/Linux,
but I forgot and didn't notice, respectively.

The behavior change I noted was for Windows.

> Why should it be any different on windows?

No good reason that I'm aware of.

It would be good to give users on all platforms an easy way to control the
behavior. E.g. a user option for buffer-name completion case sensitivity.