New lines for generics in functions

[framunoz]

Is your feature request related to a problem? Please describe.

I have noticed that when writing functions with generics, black splits the generics into more space. This is frustrating, as it makes it harder to read. Also, I feel it goes against black's philosophy, as black always tries to minimise space whenever possible.

For example, instead of writing a function like:

def foo[TypeA](
    input_a: TypeA,
    input_b: TypeA,
    input_c,
    input_d,
    input_e,
    input_f,
    input_g,
    input_h,
    input_i,
) -> list[TypeA]: ...

Black formats like this:

def foo[
    TypeA
](
    input_a: TypeA,
    input_b: TypeA,
    input_c,
    input_d,
    input_e,
    input_f,
    input_g,
    input_h,
    input_i,
) -> list[TypeA]: ...

Describe the solution you'd like

I would like to consider having a format like the one in the first code cell, to make it more concise.

[MeGaGiGaGon]

This looks to be a duplicate of #4254

[framunoz]

@MeGaGiGaGon Yep, it is. At least, the expected behaviour is the mentioned in that Issue.

[hauntsaninja]

Duplicate of #4071 , PR welcome