src/vs/workbench/services/workingCopy/common/storedFileWorkingCopyManager.ts/StoredFileWorkingCopyManager/joinPendingResolve
class StoredFileWorkingCopyManager:	private joinPendingResolve(resource: URI): Promise<void> | undefined {
		const pendingWorkingCopyResolve = this.mapResourceToPendingWorkingCopyResolve.get(resource);
		if (pendingWorkingCopyResolve) {
			return pendingWorkingCopyResolve.then(undefined, error => {/* ignore any error here, it will bubble to the original requestor*/ });
		}

		return undefined;
	}