in Sources/Markdown/Parser/BlockDirectiveParser.swift [580:589]
func indentationAdjustment(under parent: ParseContainer?) -> Int {
switch self {
case .root:
return 0
case .lineRun:
return parent?.indentationAdjustment(under: nil) ?? 0
case .blockDirective(let pendingBlockDirective, _):
return pendingBlockDirective.indentationColumnCount
}
}