Dotted could be OK. Rendering dotted lines is a bit of a pain though.
It is a little more cluttered, but is only shown when the path is selected.
Another option could be to change the Closed
checkbox to a select box: Closed
, Open
, and uhh Open + < 0% or > 100%
. Would need a reasonable name for the last. This could have the benefit that for Open
the faint extra lines are not drawn and also path constraints can't go outside 0-100%. The field would need a name though (eg Close type
), so that is two things that are hard to name.