bug#18977: 25.0.50; Enhance (fix) incremental `indent-rigidly'

[Drew Adams]

> > 2. You cannot currently provide a numeric prefix arg to `indent-
> rigidly'
> > for incremental use.  The incremental indentation you get is either 1
> > column (for <right>) or to the next tab stop (for <S-right>).
> >
> > It would be good to be able to use a numeric prefix arg interactively
> to
> > indent not only once, but each time you hit <right>.
> 
> I don't think that makes much sense -- if you've decided to indent X
> columns (by using the prefix), then you don't want to enter the
> transient map thing.

So...another "wont-fix".

I hope you're simply misunderstanding.

This would let each incremental key press move by
that increment, instead of an increment of just 1.

It boosts the incrementation.

An increment is exactly that: a given amount to
increase (likewise, decrement/decrease).

Think incf and decf, if that helps you understand.