Overlapping nodes - Are not visible when you select them
Steps to reproduce:
- open Inkscape
- create 2 shapes with two nodes snaped in one position
What happened?
-a secondary issue is that overlapping non selected 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

What should have happened?
- you should be able to see selected nodes
Inkscape Version and Operating System:
- Inkscape Version: all
- Operating System: all
- Operating System version: ...
