[HOLD] Scroll to new message

[roryabraham]

HOLD on #23229

Part of the Comment Linking project

Main issue: #20282
Doc section: https://docs.google.com/document/d/1v-ZaIRTZL5LIsyPWB0IopBNNgCajf5WC1OA8cVKtd8I/edit#bookmark=id.trn1p6c41ba
Project: Comment Linking

Feature Description

Update the New Message floating button such that it will re-render the FlatList centered on the oldest unread message in the chat.

Manual Test Steps

1. Send a message with a link to a comment that is >50 (ideally a couple hundred) messages back in the history of the same chat.
2. Mark one of the visible messages as unread, then click on the link to the older message.
3. Now receive >50 new messages from another user.
4. Verify that the New Message popover appears.
5. Click on the New Message popover.
6. Verify that you are taken to the message you marked as unread in step 2.
7. Scroll in either direction and more chats should load.

Automated Tests

Because this is convoluted to manually test, it seems like a very good candidate for some automated UI tests to prevent it breaking in the future.

[melvin-bot]

This issue has not been updated in over 15 days. eroding to Monthly issue.

P.S. Is everyone reading this sure this is really a near-term priority? Be brave: if you disagree, go ahead and close it out. If someone disagrees, they'll reopen it, and if they don't: one less thing to do!

[melvin-bot]

@roryabraham, this Monthly task hasn't been acted upon in 6 weeks; closing.

If you disagree, feel encouraged to reopen it -- but pick your least important issue to close instead.

[melvin-bot]

@roryabraham, this Monthly task hasn't been acted upon in 6 weeks; closing.

If you disagree, feel encouraged to reopen it -- but pick your least important issue to close instead.

[roryabraham]

reopening but keeping on HOLD

[melvin-bot]

@roryabraham, this Monthly task hasn't been acted upon in 6 weeks; closing.

If you disagree, feel encouraged to reopen it -- but pick your least important issue to close instead.

[roryabraham]

No update

[melvin-bot]

This issue has not been updated in over 15 days. @roryabraham eroding to Monthly issue.

P.S. Is everyone reading this sure this is really a near-term priority? Be brave: if you disagree, go ahead and close it out. If someone disagrees, they'll reopen it, and if they don't: one less thing to do!

[roryabraham]

Some new slack context: https://expensify.slack.com/archives/C01GTK53T8Q/p1720815395900939

[roryabraham]

Closing this as a dupe of #35011, which has better context at this point