Is your feature request related to a problem? Please describe.
I'm always frustrated when, I am filling type parameters of a class or a method because I don't know which type parameters I need to fill, how many there are, what the do usw.

I then need to move to my mouse, hover over the method or class to get that information. In the moment I have moved to the keyboard again, I again have forgotten the type arguments.

Describe the solution you'd like
When I am typing the "," after the double in the screenshot, it would be nice when a popup would appear, with the signature of the method, but more importantly the name and the type constraint of the type parameter. With multiple type parameters the, current type argument should be highlighted (bold font) in the pop-up. So for example when I am typing Class<Abc, def, in the popup it should appear like "Class<Type1, Type2 extends Type3>".

I know, this is probably difficult to implement and would need support in VSCode and in Server, but it's hard for me to evaluate that.