bug#7567: Please add a history variable to read-regexp

[Stefan Monnier]

>> No: new such functions should not offer both INITIAL-INPUT and
>> DEFAULT-VALUE.  Instead, they should (like read-regexp) only accept
>> DEFAULT-VALUE (and automatically add it to the prompt in the standard
>> format).

> Let INITIAL-INPUT be. -- John Lennon

> No one is forced to use it.  What did it ever do to you? ;-)

It's too low-level: better provide a DEFAULT-VALUE and then the function
can decide to do as we do (i.e. put default in prompt and in M-n) or as
they do (put it as the initial contents, selected so that
delete-selection-mode can get rid of it in a pinch).


        Stefan