When selecting a one-way segment with a closure, and another segment without a closure, it is currently possible to select "Apply on all" to extend the closure to the second segment.

This only works if the second segment has the same one-way direction of the first segment.

When a segment with an A->B/B->A closure is selected, add a new option "Apply closure in any direction", which applies the currently selected closure as "both" on all additional selected segments.