Add inferred receiver message completion.

[omarabedelkader]

Add inferred receiver message completion.

Before this change, completion worked well for direct receivers, but lost precision when the receiver was itself a message expression, for example:

`Point current degree`

In that case, the receiver of the current completion is Point current, not Point directly. The new heuristic infers the type of that receiver expression using the existing type inferencer, then proposes selectors from the inferred type hierarchy.

This avoids hardcoding selectors such as current or default, and keeps the behavior generic for any class-side factory/accessor method whose return type can be inferred.

[Ducasse]

I wonder why there is not just a list with new, default and current?

[omarabedelkader]

I thought about that, but it won't work if the user have different naming conventions or different style.

[Ducasse]

I do not get this code. We do a loop and we store into a variables so basically we get the last oen

[Ducasse]

And we need to have tests.

[Ducasse]

So continue and make it for real

[Ducasse]

I wonder if we cannot improve an existing one instead of creating a new one.

[omarabedelkader]

Ye si will investigate more, if we can improve existing one
thanks !