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

		return undefined;
	}