Update animation slice bug

[Vardner]

When animation is completed and activates onComplete callback, which removes other animation array "list" and array this.easings becomes different. After that action list have an element which this.easing doesn't. After that coming splice with index -1 and removes wrong animation element

proofs
after we delete element animation

and now we deleting index -1, so wrong element lost animation

[davidfig]

are you deleting the easing within the update loop of another easing? this was a chicken-and-egg problem that i tried to solve by ensuring all easings run regardless of what happens within the update loop.