Drag-param does not work with multi-arity functions

[Sleepful]

Sorry for not providing further information here, I think it is straightforward to reproduce.

Basically, the code action is not available once a function is multi-arity.

That's it, do tell me if it is just my machine and I can provide more info, but I suspect this will be easy to repro.

[Sleepful]

I am happy to help implement this, would require some initial pointers on where to change the code because I have not looked at the code base once.

[ericdallo]

@Sleepful, the code for this refactoring is here, I suggest starting with a test to understand why it's not working, this feature is a little bit complex so there are corner cases like that one that needs to have extra care to work