Overlapping nodes - Are not visible when you select them
#### Steps to reproduce:
<!-- Describe what you did (step-by-step) so we can reproduce: -->
- open Inkscape
- create 2 shapes with two nodes snaped in one position
#### Problem
- after selecting nodes you cannot see them

-a secondary issue is that overlapping nonselected nodes are also less visible. I think its good to show two overlapping nodes visually but I would not make them invisible. it is useful for debugging geometry.
use case

### Proposed solution
A. overpaled nores will be oseted

issue