Re: current-column and invisible text

[Richard M. Stallman]

    The invisible text does not count in the calculation of `current-column' -
    that makes sense. But I wonder about the `before-string' text. It seems that
    regardless of its length, it counts as a single column. Is this normal? If
    so, what is the rationale for this?

I think that is a bug.  I see two possible meaningful ways to handle
an overlay before-string: either ignore it, or count its contents.
The latter seems more correct.

Would someone like to look at this bug, and ack?