[Thread] Enable collapseThreads without Force Query Path (on Cache-first Path + Cache Invalidation)

[dab246]

Related

• ADR-0071 (Cache-first path: FORCE_EMAIL_QUERY = false)

Description

Pass collapseThreads: true on the cache-first path (getAllEmail()) when thread mode is enabled. Handle cache inconsistency when user toggles thread ON/OFF by clearing the email cache on toggle.

Problem

The local DB reflects whichever collapseThreads mode it was built under:

• OFF to ON: cache has individual emails, server returns collapsed — stale first yield
• ON to OFF: cache has collapsed emails, server returns all — missing emails in first yield

Tasks

• In ThreadRepositoryImpl.getAllEmail(), set collapseThreads: true when thread is enabled
• Update GetEmailsInMailboxInteractor and related interactors to propagate thread status
• Clear email cache in the thread setting toggle handler (enable to disable and vice versa)
• After cache clear, ensure getAllEmail() rebuilds cache under the correct mode

Acceptance Criteria

• Cache-first path returns collapsed emails when thread is enabled
• Toggle OFF to ON: cache is cleared, reloads with collapsed data
• Toggle ON to OFF: cache is cleared, reloads with individual emails
• No stale data displayed after toggling

[coderabbitai]

🔗 Related PRs

#4255 - Fix email content not displayed on Tablet when enabling thread view [merged]
#4316 - TF-4314 Fix unread emails disappear blink [merged]
#4323 - Fix email list does not automatically refill after bulk delete [merged]
#4372 - TF-4368 Fix cannot scroll in email list [merged]

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