ContentHandler
constructor(focusableTypes: Set<Int> = setOf(
StoryTypes.TITLE.type.number,
StoryTypes.TEXT.type.number,
StoryTypes.CHECK_ITEM.type.number,
StoryTypes.UNORDERED_LIST_ITEM.type.number,
), stepsNormalizer: UnitsNormalizationMap, lineBreakMap: (StoryType) -> StoryType = ::defaultLineBreakMap, isTextStory: (StoryStep) -> Boolean = { story ->
focusableTypes.contains(story.type.number)
})