src/vs/workbench/services/workingCopy/common/workingCopyBackupService.ts/WorkingCopyBackupsModel/move
class WorkingCopyBackupsModel:	move(source: URI, target: URI): void {
		const entry = this.cache.get(source);
		if (entry) {
			this.cache.delete(source);
			this.cache.set(target, entry);
		}
	}