Every pointer move replaces the comp's content identity, so the frame on
screen takes a new cache key at every step while its render is still in
flight; the viewer only ever showed an exact key, so the picture froze on
the last completed frame until the drag ended. While a drag or a property
scrub is running, show the newest frame of the same comp, frame, scale,
view and render options that is ready — a render behind, as After Effects
does — and go back to exact frames when it stops.
Aavirash
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