There were cases in the editor where rewinding of transforms would
leave the `DrawableHitObject` in a non-`IsPresent` state, resulting in
this scheduled logic never running.
This would in turn cause ghost hitobjects, which disappear under certain
circumstances.
Reproduction:
- Open editor to empty beatmap
- Place single hitcircle at current point in time
- Drag editor timeline backwards to seek before zero, and wait for
return to zero
- Select hitcircle in playfield
- Drag hitcircle to right in timeline, triggering a start time change
This was firing regardless of whether the start time was changed, such
as where beat snap provided the same time the object already has.
The case where a change actually occurs is already handled by
EditorBeatmap (see `startTimeBindables`), so it turns out this local
handling is not required at all.
This brings back the ability for the carousel to scroll in a classic
way. It turns out this is generally what we want for "seek" operations
like "random", else it's quite hard to get the expected animation.
I did experiment with applying the animation after the pooled panels are
retrieved, but in a best-case scenario there is still a gap where no
panels are displayed during the random seek operation.