src/vs/editor/contrib/hover/hoverOperation.ts/HoverOperation/cancel
class HoverOperation:	public cancel(): void {
		this._loadingMessageScheduler.cancel();
		if (this._state === ComputeHoverOperationState.FIRST_WAIT) {
			this._firstWaitScheduler.cancel();
		}
		if (this._state === ComputeHoverOperationState.SECOND_WAIT) {
			this._secondWaitScheduler.cancel();
			if (this._asyncComputationPromise) {
				this._asyncComputationPromise.cancel();
				this._asyncComputationPromise = null;
			}
		}
		if (this._state === ComputeHoverOperationState.WAITING_FOR_ASYNC_COMPUTATION) {
			if (this._asyncComputationPromise) {
				this._asyncComputationPromise.cancel();
				this._asyncComputationPromise = null;
			}
		}
		this._state = ComputeHoverOperationState.IDLE;
	}