Lars Ingebrigtsen <larsi@gnus.org> writes:

>> However, that has one major drawback: now you cannot delete all
>> whitespace including newlines before/after point because that would
>> require you to provide (zerop N) and (< N 0) at the same time.
>
> Isn't `M--' the magic incantation for deleting newlines for these
> commands?  `M--' isn't the same as `C-u -1'...

Indeed, they are not the same but their prefix-numeric-value is the
same.  So now I've made it so that the prefix arg `-' has the general
meaning of including newlines but it's up to the action to decide how it
is interpreted as a number, e.g., just-one-space treats it as -1 as
usual but delete-space-before/after treat it as zero.

New patch attached.  Some final nitpicking please.  And some thoughts
about default value for cycle-spacing-actions.  Maybe only

  (just-one-space delete-all-space restore)

which would mimic the current cycle-spacing behavior?

Bye,
Tassilo