src/vs/workbench/contrib/debug/common/replModel.ts/ReplGroup/addChild
class ReplGroup:	addChild(child: IReplElement): void {
		const lastElement = this.children.length ? this.children[this.children.length - 1] : undefined;
		if (lastElement instanceof ReplGroup && !lastElement.hasEnded) {
			lastElement.addChild(child);
		} else {
			this.children.push(child);
		}
	}