Comment 3 for bug 170401

Actually we have what you describe:

- create a stroke-only shape, no fill

- make a linked offset, inset it a bit inwards, paint it
with your fill color and no stroke

Voila, you have an inner fill which does not run into stroke
and which correctly updates when you move or node-edit the
stroke object. The only thing it doesn't do is react to the
changes in stroke width - you'll have to update the inset
distance manually.