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Dean Herbert d096f2f8f6 Fix potential cross-thread operation during chat channel load
The callbacks are scheduled to the API thread, but hooked up in BDL
load. This causes a potential case of cross-thread collection
enumeration.

I've tested and it seems like the schedule logic should be fine for
short term. Longer term, we probably want to re-think how this works so
background operations aren't performed on the `DrawableChannel` in the
first place (chat shouldn't have an overhead like this when not
visible).

Closes #11231.
2020-12-21 16:39:50 +09:00
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