Let beat cursor end at playback range end.

[Danielku15]

#2507

Current Behavior
Currently the beat cursor might move across the selected playback range due to the simple fact that actual end of the beat is where the next beat starts. And we typically animate the cursor from one beat to the next.

Desired improvement
If there is a playback range, the beat cursor should be animated to the end of the selected range instead.

Technical details
We currently have two modes conditions: either we animate to the next beat or to the end of the bar (e.g. on repeats or jumps).

One thing we could do is: check whether the start of the next beat is "after" the playback range end tick, and in this case adjust the end-x position to which we animate. (realbounds x+width)