Allow quick selection of the animation set on a preview track

[misaki-eymard]

Currently, if you don't precisely remember which animation was set for a track in the Preview View, the following steps may be necessary to set an animation assigned to that track as the current animation:

1. Select the specific track number.
2. Locate the highlighted animation in the list of animations.
3. Select the highlighted animation as the current animation in either the Tree or Animations view.

If you only occasionally use the preview view track, this operation isn't particularly bothersome. However, if you constantly need to combine multiple animations using the preview view, this process becomes somewhat redundant. It would be more efficient if a hotkey allowed you to instantly select the animation set on each track as the current animation.

Related forum post:
https://esotericsoftware.com/forum/d/29487-reaction-proposal-when-click-on-preview-tracks