Method isInsignificantTextNode

src/trix/models/html_parser.js:392–399

(node)

  }

  isInsignificantTextNode(node) {
    if (node?.nodeType !== Node.TEXT_NODE) return
    if (!stringIsAllBreakableWhitespace(node.data)) return
    const { parentNode, previousSibling, nextSibling } = node
    if (nodeEndsWithNonWhitespace(parentNode.previousSibling) && !this.isBlockElement(parentNode.previousSibling)) return
    if (elementCanDisplayPreformattedText(parentNode)) return
    return !previousSibling || this.isBlockElement(previousSibling) || !nextSibling || this.isBlockElement(nextSibling)
  }

  isExtraBR(element) {
    return tagName(element) === "br" && this.isBlockElement(element.parentNode) && element.parentNode.lastChild === element