src/vs/workbench/services/workingCopy/common/untitledFileWorkingCopyManager.ts/UntitledFileWorkingCopyManager/doCreateOrGet
class UntitledFileWorkingCopyManager:	private doCreateOrGet(options: IInternalUntitledFileWorkingCopyOptions = Object.create(null)): IUntitledFileWorkingCopy<M> {
		const massagedOptions = this.massageOptions(options);

		// Return existing instance if asked for it
		if (massagedOptions.untitledResource) {
			const existingWorkingCopy = this.get(massagedOptions.untitledResource);
			if (existingWorkingCopy) {
				return existingWorkingCopy;
			}
		}

		// Create new instance otherwise
		return this.doCreate(massagedOptions);
	}