RE: buffer name completion is case-sensitive now

[Drew Adams]

> > Well, that's a matter of opinion.  The default value of `completion-
> > ignore-case' is nil for all other systems bar MS-Windows. I agree
> > with you that buffer names are another case, in addition to
> > filenames,  where MS-Windows systems should do case-insensitive
> > completion. I  think that
> 
> Given the fact that buffer-names are generally derived directly from
> file-names, I suggest we change read-buffer to obey
> read-file-name-completion-ignore-case.

For the record, I disagree. I won't repeat all that was said, but some of us
have pointed out that the two kinds of object are different. Buffer names are
_not_ generally derived directly from file names.

> > Is it okay to install the following change?
> 
> I don't think we need yet-another configuration variable for that.
> We should just reuse read-file-name-completion-ignore-case.

Again, I disagree. A screw is not a nail, even if it is sometimes good enough to
just hammer it in.