bug#19032: 24.4; icomplete cannot select matches with C-x b with no input

[Lars Ingebrigtsen]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

> Would it be cleaner to have the following instead?
>
>       ;; Allow user to specify null string.  Obey 
> `completion-content-when-empty`.
>       ((= beg end)
>        (when completion-content-when-empty
>          (completion--replace beg end completion-content-when-empty))
>        (funcall exit-function))
>
> So icomplete would be in charge of setting that var to the `car` of
> `completion-all-sorted-completions`.

Yeah, that makes sense.  I'll take a stab at implementing it that way.

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