Eric Traut fce10e009d tui: keep cleared Fast tier from reappearing after side-thread resume (#23121)
## Why

After turning Fast mode off in the TUI, returning from a side thread
could make `Fast` appear again in the main chat widget. The opt-out
itself was still persisted; the display was being rebuilt from stale
cached `ThreadSessionState` data, which made it look like Fast had been
re-enabled.

Fixes #23104.

## What changed

- Keep the active thread's cached `service_tier` in sync whenever the
user persists a service-tier selection.
- Update both the primary-thread snapshot and the thread event store so
restored TUI state reflects the current tier.
- Add a focused regression test for clearing a cached Fast tier.

## Manual repro

1. Start a TUI session where `Fast` is enabled by default.
2. Run `/fast` and turn Fast mode off. Confirm `Fast` disappears from
the chat widget display.
3. Re-enter thread navigation via either path:
   - Run `/side test`, then return to the main thread.
   - Run `/agent`, enter a child thread, then return to the main thread.
4. Before this fix, `Fast` reappears in the main chat widget display
even though the opt-out was already persisted.
5. After this fix, `Fast` stays cleared.

## Verification

- `cargo test -p codex-tui
app::thread_session_state::tests::service_tier_sync_updates_active_cached_session
-- --exact`
fce10e009d · 2026-05-18 08:52:18 -07:00
6,591 Commits
2026-04-24 17:49:29 -07:00
2025-04-16 12:56:08 -04:00
2025-04-16 12:56:08 -04:00
2026-04-24 17:49:29 -07:00
2026-04-07 10:55:58 -07:00

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