Mobile-Server Compatibility

New server, old mobile:

• New parent message in a channel

  • Channel is marked as unread on mobile and desktop

  • Channel is viewed from either mobile or desktop: channel marked as unread on both mobile and desktop

• New message in an unfollowed thread

  • On desktop:

    • No unread notification exists unless a new parent message is posted

  • On mobile:

    • Channel is marked as unread

    • Channel is viewed: Marks the channel as read

• New message in auto-followed thread

  • On desktop:

    • Unread indicator on the sidebar thread item

    • Thread is viewed: thread is marked as read on desktop, but on mobile the channel still shows an unread indicator

    • Channel is viewed: Channel is marked as read on desktop and mobile (even if some of the threads haven’t been viewed in the channel), but the followed threads remain unread on desktop

  • On mobile:

    • Channel is marked as unread

    • Channel is viewed: Marks the channel as read on mobile and desktop and the threads as read (We can detect that the app is on an older version, and if so mark the channel and any followed threads in it as read). We need to do the same thing if the user turns off the collapsed threading, ie viewing a channel marks the channel and the threads as read

Old server, new mobile:

No new threading option (server does not support it), but the mobile app needs to support old and new threads for new servers, and the old threading model on old servers.

New Server, new mobile:

Show new threading option (user can choose in account settings to disable or enable folded threads)

Old server, old mobile:

No new threading option (server or mobile app does not support it)