Function resolve

src/utils/sessionStorage.ts:2015–2028

(start: UUID)

  // compression: after resolving, seed the map with the resolved link so
  // subsequent survivors sharing the same chain segment don't re-walk.
  const resolve = (start: UUID): UUID | null => {
    const path: UUID[] = []
    let cur: UUID | null | undefined = start
    while (cur && toDelete.has(cur)) {
      path.push(cur)
      cur = deletedParent.get(cur)
      if (cur === undefined) {
        cur = null
        break
      }
    }
    for (const p of path) deletedParent.set(p, cur)
    return cur
  }
  let relinkedCount = 0
  for (const [uuid, msg] of messages) {
    if (!msg.parentUuid || !toDelete.has(msg.parentUuid)) continue