Theme question/bug? Horizontal lines above function declaration

Anyone else seeing horizontal lines above function declarations (JS in my example?) I’ve tried every selector I can find/think of to get rid of these, but to no avail. It does these whether or not functions are rolled up or not.

Is that different than the Type and function separators preference?

My Gosh! It is! I’ve never seen an option like that before! Fantasic. Gone. Thanks.

Tangentially related, does anyone know the selector for these separators to style them in a custom theme?

They are not theme stylable, as they are drawn by the editor directly and not the theme system. We can take it under consideration to potentially make this themable.