Function blockDelta

packages/quill/src/blots/block.ts:183–193

(blot: BlockBlot, filter = true)

// It is important for cursor behavior BlockEmbeds use tags that are block level elements

function blockDelta(blot: BlockBlot, filter = true) {
  return blot
    .descendants(LeafBlot)
    .reduce((delta, leaf) => {
      if (leaf.length() === 0) {
        return delta;
      }
      return delta.insert(leaf.value(), bubbleFormats(leaf, {}, filter));
    }, new Delta())
    .insert('\n', bubbleFormats(blot));
}

function bubbleFormats(
  blot: Blot | null,