function findHigherSheet(registry, options) {
  for (let i = 0; i < registry.length; i++) {
    const sheet = registry[i]
    if (
      sheet.attached &&
      sheet.options.index > options.index &&
      sheet.options.insertionPoint === options.insertionPoint
    ) {
      return sheet
    }
  }
  return null
}
Find attached sheet with an index higher than the passed one.