Yeah, it looks like a bug that you can't drag a subanimation back out. Submit it to the tracker.
I'm still debating if sub-animations were a good idea to implement. It's tempting just to turn them off. There's a vague case for having them for two reasons:
- Organising animations
- Having more complex animation structures, like "Stopped" and "Walking" animations, then subanimations for carrying different weapons/wearing different clothes/whatever. So you'd have subanimations under "Walking" like "Walking with nothing", "Walking with sword", "Walking with shield", "Walking with sword and shield". But I think this could be better done with separate sprites for the different things, and just have one generic walking animation.
What do you think? Should we have sub-animations? People often ask what they are for (and the above two things are the only thing), so I guess it isn't intuitively obvious.