src/vs/workbench/services/workingCopy/common/workingCopyService.ts/WorkingCopyService/getAll
class WorkingCopyService:	getAll(resource: URI): readonly IWorkingCopy[] | undefined {
		const workingCopies = this.mapResourceToWorkingCopies.get(resource);
		if (!workingCopies) {
			return undefined;
		}

		return Array.from(workingCopies.values());
	}