This stores the hash for the last viewed announcement.
The intention is so that the announcement won't re-appear when logging into another device.
However, this does mean that announcements would need to wait until the first sync to decide whether to appear or not, which can be quite a delay.
## Issue
- When signing up, the "channel suggestions" page was stuck because `prefsReady` was never set as `preference_get` was never called.
- It was never called due to the optimizations to skip it when there is no difference between the local and server wallet.
## Change
- The first ever `sync/get` will result in a "no wallet" error, and there is already a `catch` to handle it. But the change in 38c13cf5 caused the `catch` to be skipped and went directly to `sync_apply` instead. Although the `catch` is also doing the same thing (`sync_apply`), it also has an additional callback to call `preference_get`.
- Fixed by ensuring this scenario ends up in the `catch` block like it was originally intended.
- We also did some optimization in the callback to skip the final `preference_get` if there is no difference in hash. But for the case of signing up, we do want to run it (so that `prefsReady` and other stuff gets initialized), so pass `hasNewData = true` to the callback.
## Repro
1. Follow a channel.
2. When `preference_set` is sent, unfollow the channel.
3. A few seconds later, the final setting reflects (1) instead of (2).
The current sync loop involves doing a final `sync/get` at the end. While not necessary for the scenario above, the code flow covers various cases, so it's still needed for now.
## Approach
Implement an abort mechanism to the sync-loop.
When syncing from the `buildSharedStateMiddleware` loop, generate an ID for each sync session, and only store the latest one. Pass the ID to the completion-callback (and other places as needed), so we can check if our session is still the latest one before executing the callback.
The check for invalidation can also be placed in more places to cut off the sync process earlier, but it's only done for 2 critical places for now.
## Why
- No memo required (no transformation).
- `makeSelect*` is an incorrect pattern.
## Changes
- Replaced makeSelectClientSetting with selectClientSetting.
- Remove unused selectShowRepostedContent.
## Changes
- doHandleSyncComplete: only call doGetAndPopulatePreferences when there is new data.
- But for that to work, we'll need to populate preferences at least once. We'll do that in doSignIn.
- We can also remove the "sync/prefs ready" mechanism that was mainly meant for Desktop.
Then came another problem: while trying to spark changes between 2 tabs, `sync/get` was saying "no change" despite the local and server hash being different. I think it is because the both `sync_hash + sync/get` combo is operating on server data, so the hash is the same. I'm guessing this is why we ended up just running doGetAndPopulatePreferences every time before PR, since this flag wasn't correct in this scenario.
- Updated `data.changed` to consider both API results and comparison with local hash.
## Tickets
- 5504 Signing out of account causes page to break in other tabs
- 6829 merged accounts - force log out / fail sync when x-auth-token and cookie auth token are different
## Steps to replicate
1. Login to odysee with account-A.
2. Open another tab, and split both tabs on the screen.
3. Logout from the 1st tab. Do not activate (focus) the 2nd tab.
4. On the 1st tab, login with account-B.
5. Activate (focus) the 2nd tab. The wallet would have been merged, and we are still logged in as account-A.
## Approach
Reload when the LBRY API token no longer matches the auth token.
