Quick info on JSX element should show inferred type arguments

[ghost]

TypeScript Version: 3.2.0-dev.20181023

Search Terms:

Code

class C<T> extends React.Component<T> {}
const x = <C x={42} />;

Expected behavior:

Quick into at the use of C should show C<{ x: number }>.

Actual behavior:

Just shows class C<T>.

[DanielRosenwasser]

I think this would also fix #23716.