bug#14153: 24.3.50; regression: `crm--choose-completion-string' expects wrong args

[Drew Adams]

> > Each such function should accept 4 args, as follows:
>  
> >  CHOICE - the string to insert in the buffer,
> >  BUFFER - the buffer in which the choice should be inserted,
> >  MINI-P - non-nil if BUFFER is a minibuffer, and
> >  BASE-SIZE - the number of characters in BUFFER before
> >           the string being completed.
> 
> Duh, sorry indeed, could you please update this docstring to 
> match the code?

Sorry, I don't know what the new code parameters mean.  S?he who changes the
signature is best placed to update the spec/doc of that signature.

> > But `crm--choose-completion-string' expects these args:
> >  (CHOICE  BUFFER  BASE-POSITION  &rest IGNORED)
> 
> Which is indeed the correct calling convention nowadays.

How do you deal with older code that calls with a MINI-P parameter?

It's one thing to ignore old parameters that you don't need anymore.  It's quite
another thing to change the signature so much that old calls provoke errors.

This is apparently not about some particular function such as
`crm--choose-completion-string'.  It is about
`choose-completion-string-functions', which has been around a long time and is a
general purpose hook.

Anyway, since you've changed the code, please change the doc string accordingly,
whatever that might mean/entail.  Thx.  If you really need help with the
wording, then communicate the meaning (content), and I will be glad to suggest
wording.