bug#14806: 24.3.50; Enabling read-file-name-completion-ignore-case breaks url-handler-mode

[Glenn Morris]

Stephen Berman wrote:

> 0. emacs -Q
> 1. M-: (setq read-file-name-completion-ignore-case t)  (or customize it,
>    or use set-variable)
> 2. M-x url-handler-mode
> 3. C-x C-f http://www.gnu.org RET
> => error "Unimplemented"

RET actually runs minibuffer-complete-and-exit, when
completion-ignore-case is non-nil it tries to complete the input,
completion is (obviously) not implemented for URLs.
Dunno what to do about that.