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

[Stefan Monnier <monnier@iro.umontreal.ca>]

>> So after reading the rest of the thread, I think I finally understand
>> that you want to "add a history *argument* to read-regexp", right?
>> Then it sounds perfectly acceptable.

> For consistency, `read-regexp' could have the same function signature
> as other minibuffer reading functions, e.g. like `read-string':

>   (read-string PROMPT &optional INITIAL-INPUT HISTORY DEFAULT-VALUE INHERIT-INPUT-METHOD)

>   (read-regexp PROMPT &optional INITIAL-INPUT HISTORY DEFAULT-VALUE INHERIT-INPUT-METHOD)

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).


        Stefan