31a19e13a0
This change splits the list of animations and transitions, which are almost always handled differently. It also renames `ElementAnimationState` to `ElementAnimationSet` and establishes an `AnimationState` for every transition and animation. This allows us to stop continually reallocating lists every time a transition or animation needs to be canceled. Fixes #14419. Depends on D78189 Differential Revision: https://phabricator.services.mozilla.com/D78190
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