src/vs/workbench/services/decorations/browser/decorationsService.ts/DecorationRule/constructor
class DecorationRule:	constructor(data: IDecorationData | IDecorationData[], key: string) {
		this.data = data;
		const suffix = hash(key).toString(36);
		this.itemColorClassName = `${DecorationRule._classNamesPrefix}-itemColor-${suffix}`;
		this.itemBadgeClassName = `${DecorationRule._classNamesPrefix}-itemBadge-${suffix}`;
		this.bubbleBadgeClassName = `${DecorationRule._classNamesPrefix}-bubbleBadge-${suffix}`;
		this.iconBadgeClassName = `${DecorationRule._classNamesPrefix}-iconBadge-${suffix}`;
	}