Switching sessions moved the conversation on screen before the swap: the
composer and the status chip followed the live selection and re-shaped a
commit ahead of the timeline, so the pinned outgoing chat jumped; and the
reveal effect re-ran for the outgoing session when its waited flag flipped,
hiding it a few frames before the next one mounted. The chat column now
reads one deferred session, and the reveal runs once per opened session.
Bohdan Triapitsyn
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