Function favoriteFolderKey

packages/app-core/src/lib/vault-layout.ts:548–550

(folder: NoteFolder, subpath: string)

 * do, so the colon discriminates the two.
 */
export function favoriteFolderKey(folder: NoteFolder, subpath: string): string {
  return folderIconKey(folder, subpath)
}

export function isFavoriteFolderKey(key: string): boolean {
  return key.includes(':')