fix: possible bad state when resuming multiple times with a slow client #1721
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Some requests can make the client application run slow. If the user
tries to resume multiple times when paused and "stuck", it's very easy
to get into a bad state.
With this change, coalesce multiple requests of the same type together
so that clicking resume while stalled doesn't tear the state.
I couldn't really get a consistent test case for this since it's
timing based :/
Found while investigating #1719