Archive action should apply to entire conversation thread

[capitanroy]

Problem

When viewing a conversation with multiple messages, the archive button only archives the single selected message rather than the entire thread. This leaves other messages from the same conversation in the inbox, which is unexpected — most email clients (Gmail, HEY, Apple Mail) archive the full conversation.

Expected behavior

Clicking the archive button (or pressing e) while viewing a conversation should move all messages in the thread to the Archive folder, not just the currently displayed message.

Current behavior

Only the individual message is moved via Email/set → mailboxIds. The other messages in the thread remain in the Inbox.

Suggested implementation

When archiving, resolve the full thread via Thread/get for the message's threadId, then batch-update all message IDs in a single Email/set call:

["Email/set", {
  "accountId": "...",
  "update": {
    "<msg1>": { "mailboxIds": { "<archiveId>": true } },
    "<msg2>": { "mailboxIds": { "<archiveId>": true } },
    ...
  }
}, "0"]

This keeps it as a single JMAP round-trip.

[ma2t]

Hi @capitanroy,

Good point. Right now archive only moves the selected message. I'll look into
making it apply to the full thread, same as Gmail does.

[capitanroy]

Thank you! And thanks to the team for working on this, it's really helpful.