Fix race condition in Entity batching. #2537
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Fixes #2514 (and other related issues as discussed [on the forum](https://groups.google.com/d/msg/cesium-dev/JOUCjnqeFKg/q5aAZb2faAMJ)). The problem was that when static entities were updated, we would create a primitive to batch them. However, if the entities were updated again before the primitive was ready, we didn't remove it.
pjcozzi
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…ndition Fix race condition in Entity batching.
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Fixes #2514 (and other related issues as discussed on the forum).
The problem was that when static entities were updated, we would create a primitive to batch them. However, if the entities were updated again before the primitive was ready, we didn't remove it.
I don't have a good way to unit test this yet, but there is a Sandcastle example in #2514. Moer throughly testing these private classes is on the roadmap, but shouldn't hold up this fix (which lots of people are running into).