isValidConnection prop on SvelteFlow doesn't trigger for attempted target to target or source to source handle connections

[mcmxcdev]

Describe the Bug

As can be seen in the video below, the validation between handles using isValidConnection only kicks in for certain attempted connections.

We would also like to validate an attempted source to source or target to target connection and give the user information about why this is not allowed.

Your Example Website or App

No response

Steps to Reproduce the Bug or Issue

• create a SvelteFlow using isValidConnection prop
• create two nodes each having a target and source handle
• try to connect source to source or target to target
• expect isValidConnection to not get triggered

Expected behavior

I would expect any attempted connections between handles to trigger isValidConnection

Screenshots or Videos

Screencast.from.2024-04-17.09-17-45.webm

Platform

• OS: Ubuntu 23.10
• Browser: Brave
• Version: Version 1.64.122 Chromium: 123.0.6312.122 (Official Build) (64-bit)

Additional context

No response

[moklick]

Are you using connectionMode={ConnectionMode.Loose} ?

[mcmxcdev]

Oh wow I didn't know that exists! I will have a look into it and get this issue closed if it works as expected ;)

[moklick]

Does it work for your @mcmxcdev ?

[mcmxcdev]

It ended up not being a high priority for us; an initial check worked fine, but I will test this out properly some other time!

Closing the issue in the meantime