Do not add a blank line after single-line docstrings about blue HOT 4 CLOSED

@dataclass
class Line:
    """Holds leaves and comments. Can be printed with `str(line)`."""

    depth: int = 0
    leaves: List[Leaf] = field(default_factory=list)
    # keys ordered like `leaves`
    comments: Dict[LeafID, List[Leaf]] = field(default_factory=dict)
    bracket_tracker: BracketTracker = field(default_factory=BracketTracker)
    inside_brackets: bool = False
    should_explode: bool = False

    def append(self, leaf: Leaf, preformatted: bool = False) -> None:
        """Add a new `leaf` to the end of the line.

        Unless `preformatted` is True, the `leaf` will receive a new consistent
        whitespace prefix and metadata applied by :class:`BracketTracker`.
        Trailing commas are maybe removed, unpacked for loop variables are
        demoted from being delimiters.

        Inline comments are put aside.
        """
        has_value = leaf.type in BRACKETS or bool(leaf.value.strip())
        ...