David Emmerson

https://github.com/OmniSharp/omnisharp-roslyn/issues/1074 was marked as a duplicate of this, but in fact they are different. This is talking about large files taking a long time and timing out. 1074 is talking...

In the disposal method it's using the `_activeEndpointsSemaphore` around a mutation of `_activeEndpointServiceScopes`, so I think it needs the same done around the call to `.Add` in this case? ```c#...