Re: completing-read case problem

[Richard Stallman]

    > It is unreasonable to use a case-sensitive predicate with
    > completion-ignore-case non-nil.

    But it can be inconvenient if one has to avoid using a case-sensitive
    predicate.

Not very much.  You just have to downcase the string first.

It would be inconvenient to change Emacs to remove this requirement,
and I don't have time to even think about it.

    You get a buffer "*Customize Group: Mouse*" showing no members of the
    (non-empty) group 'mouse -- which is not what is intended.  This
    problem appears because of completing-read with non-nil
    completion-ignore-case in customize-group.  completing-read returns
    "Mouse", which is not the symbol-name of group 'mouse.

There are two ways to fix this:

1. Decide that case is significant in custom group names,
and read them case-sensitively.

2. Decide that case is not significant in custom group names,
and that they should all be lower case.

Either one seems ok to me.
What do others think?