bug#45333: complex command history should not save optional nil parameters

[Michael Heerdegen]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> Ah; thanks.  Yes, we land things like
>
> (replace-string "foo" "bar" nil nil nil nil nil)
>
> in `command-history' -- where all those nils are optional.  We could
> pretty easily filter those out by looking at the signature of the
> function and peeling off trailing nils, I think?  Would there be any
> disadvantages to doing so?

Note that there are only such `nil`s when the evaluation of the
interactive spec returned them.  It's somewhat consistent if the command
history includes the argument list exactly as returned by `interactive'.

The more general problem is to provide interactive forms that work
nicely with `repeat-complex-command' - something programmers are often
not aware of when writing commands.

Anyway, trying of prettify away those `nil`s seems like overkill to me.
In theory even an optional `nil' can be significant.

Michael.