Change Details

The last part of unifying the logic and source of truth for determining eligible messages to be sidebar sources is to have a `canBeSidebarSource` function in each message spec. This diff introduces the constant to each existing message spec, and the next diffs will replace the logic in to `isInvalidSidebarSoruce` to call the message spec. This ensures that we'll only ever need to update the specific message spec in one place if we ever want to change this. Depends on D9324 Addresses 1c of [[https://linear.app/comm/issue/ENG-4849/thread-from-robotext-about-pinned-message-causing-errors#comment-36f2e045 | ENG-4849]].

The last part of unifying the logic and source of truth for determining eligible messages to be sidebar sources is to have a `canBeSidebarSource` function in each message spec. This diff introduces the constant to each existing message spec, and the next diffs will replace the logic in to `isInvalidSidebarSoruce` to call the message spec. This ensures that we'll only ever need to update the specific message spec in one place and the `ValidRawSidebarSourceMessageInfo` type if we ever want to change this. Depends on D9324 Addresses 1c of [[https://linear.app/comm/issue/ENG-4849/thread-from-robotext-about-pinned-message-causing-errors#comment-36f2e045 | ENG-4849]].

The last part of unifying the logic and source of truth for determining eligible messages to be sidebar sources is to have a `canBeSidebarSource` function in each message spec. This diff introduces the constant to each existing message spec, and the next diffs will replace the logic in to `isInvalidSidebarSoruce` to call the message spec. This ensures that we'll only ever need to update the specific message spec in one place and the `ValidRawSidebarSourceMessageInfo` type if we ever want to change this. Depends on D9324 Addresses 1c of [[https://linear.app/comm/issue/ENG-4849/thread-from-robotext-about-pinned-message-causing-errors#comment-36f2e045 | ENG-4849]].