Get helm links to work even if buffer has been modified (and so nodes have moved)

[facetframer]

This is relevant when reviewing a number of results with helm-resume. One work-around is to review the items in reverse order.

I imagine using markers would work moderately well.

[alphapapa]

Sounds neat. Just remember that markers can impact performance, so e.g. if you added one for every node in a large file...