- Fixes floating inputs have invisible segment after moving
- Fixes floating input can be moved onto existing input link, resulting
in the slot having two links
Prevents nodes connecting links to themselves when moving existing
links.
If moving multiple links with reroutes, this will instead _reconnect_
any links that would become loopbacks, only without any rereoutes.
- Follow-up on #817
### Unit tests
Adds tests for:
- LinkConnector
- LGraph
### Integration tests for LinkConnector
- Uses and configures a real graph + LGraph
- Avoids mocks
- User input is still mocked
- Performs actual tasks as would be called by LGraphCanvas
- A little verbose in places, but _many_ edge cases are caught by these
tests
