Function updateCurrentAttributes

src/utils/Transaction.js:338–344

(currentAttributes, { key, value })

 * @function
 */
const updateCurrentAttributes = (currentAttributes, { key, value }) => {
  if (value === null) {
    currentAttributes.delete(key)
  } else {
    currentAttributes.set(key, value)
  }
}

/**
 * Call this function after string content has been deleted in order to