Show fully qualified function name on hover tooltip

[georgesboris]

Expected Behavior

When using aliases or importing all functions of a module, it's useful to know the origin of the function right where you are using it. This is an example of how it works on Elixir language server:

Current Behavior

Currently we only get the function docs. But see how there is nothing here that points to Url.Builder :

Context

When debugging a piece of code it's pretty useful to not leave the scope of the function I'm trying to understand. Currently I have to backtrack the origin of multiple functions and hold it all in my head while I understand the thing I was actually focusing on.

[ymtszw]

I had thought about this too!
Since in Elm and other languages with similar module system, we create "namespaces" using modules and expose similarly-named functions from them. For that we have many functions with the same name from multiple modules. This feature definitely helps identifying therir origins.

[razzeee]

Should be pretty easy to do, the only real question is how to display it nicely