Enable room history to be shown immediately upon first opening a room #171
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Move the logic for processing background timeline updates to a separate function, such that we can run that procedure the very first time a room is opened. If any updates were processed, we immediately redraw the timeline, which removes all visible latency that previously existed, as previously, a timeline wouldn't be redrawn until the first pagination response was received.
There is one exception to this, which is when a timeline is cleared. It still gets drawn properly, but since it's been cleared, there is nothing that actually gets drawn.
This problem requires a completely separate solution, e.g., not actually setting the existing
TimelineUiState::items
field to thenew_items
vector from the TimelineUpdate until another (or several more) pagination responses have been received and the timeline has been sufficiently backfilled.