Function fl::smush::hrule3_smush

pub fn hrule3_smush(ch1: u8, ch2: u8) -> Option<u8>

Rule 3: HIERARCHY SMUSHING (code value 4)

A hierarchy of six classes is used: "|", "/", "[]", "{}", "()", and "<>". When two smushing sub-characters are from different classes, the one from the latter class will be used.