Method _getLineNumberRelativeTo

external/.scrollLibs.js:15398–15402

(relativeTo)

    return !this.length && !this.content
  }
  _getLineNumberRelativeTo(relativeTo) {
    if (this.isRoot(relativeTo)) return 0
    const start = relativeTo || this.root
    return start._getLineNumber(this)
  }
  isRoot(relativeTo) {
    return relativeTo === this || !this.parent
  }