Don't dispose the CancellationTokenSource until all onCancellationRequested handlers have run #199067
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Fix #199068
The CancelablePromise disposes its CancellationTokenSource inside a onCancellationRequested listener. That means that any other onCancellationRequested listeners that were added after that one won't be called, because the EventEmitter has been disposed. In practice that means that any listener that was added after an async step inside the callback function is not called.