[2.6.2] Canceled tasks should throw TaskCanceledException instead of InvalidOperationException

[JechoJekov]

Currently, when waiting on a task and the task is canceled "InvalidOperationException" is thrown instead of "TaskCanceledException" as in .NET Framework. Since it is possible that the task itself throws "InvalidOperationException" during its execution the caller of the task cannot distinguish between the two cases based on the exception catch. Therefore, it would be better to throw "TaskCanceledException" to let the caller know that the task was canceled.

[JechoJekov]

If you agree with the above I can prepare a pull request.

[erik-kallen]

Full cancellation support (with cancellation tokens and everything) is already in the roslyn branch, but if you make a decent pull request we can absolutely merge that into develop

[n9]

There is original issue with commit ref: #398