SolverHandler: Changing transformTarget does not recalculate the Solver

[Alexees]

Describe the bug

The SolverHandler does not update it's inner workings when assigned a new TransformTarget. It's neither recalculating it's transformWithOffset nor is there any API call that would make changing what to operate on easy. There is also no option for a custom reference in TrackedObjectType

To reproduce

There is not much to reproduce other than checking out the API

Expected behavior

Setting a new TransformTarget recalculates the Solver to use it

Additional context

I have a menu that jumps around depending on where it's used.