Intellisense for overriding methods

[Happypig375]

Specifically, I would like to see Intellisense enabled when I type

[<AbstractClass>] type A() = abstract M : unit -> unit
type B() = inherit A()
 override __.

A member list with M would be shown, and I can select it. This is super useful to find out which methods can be overridden for a class from a library.

[dirtybytes]

This is sorely needed. No intellisense when overriding a member makes discovering APIs in F# a miserable experience.

To demonstrate the problem - define a class in a C# project:

public class CSharpClass {
 public virtual void DoSomething() { }
 public virtual string DoSomethingElse(int x) => "";
}

Then try to inherit from it in an F# project in the same solution:

type CSharpClassDerived() =
 inherit CSharpClass()
 override this.DoSomething() = () // no help from the IDE whatsoever until after you've finished typing the entire line
 override this.DoSomethingElse x = "" // a list of members pops up only after typing the first uppercase D