Don't use activeContext for standby/leader cancelation #4919
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Move cancelation to after cleanup. This is my guess as to what's happening here, but I could be totally off base.
It looks like we call cancelation on
activeContext
, but then pass that context to the function. I moved the cancelation to after cleanup, and made context a local param to reduce the chance of a race if another func modifies c.activeContext/cc @briankassouf @jefferai
Fixes GH-4915