Relationship anchors

This is actually a feature...

I've found that a LOT of time goes into re-aligning relationships that has added points, each time elements are moved, the relationships are pulled askew.

In Archi 4, the alignment tools helps A LOT, but the relationships still need to be re-aligned.

Would be great if there was a flag option that locks the lines in their perpendicular position and just lengthens them when the linked elements is moved?

Start by reproducing the relationship movement behavior described for Archi 4's alignment tools, using elements with added relationship points. The feature is complete when a lock option keeps relationship lines perpendicular as linked elements move and only lengthens the lines.

Written by the indexing model from the issue text.