src/vs/base/browser/ui/selectBox/selectBoxCustom.ts/SelectBoxList/updateDetail
class SelectBoxList:	private updateDetail(selectedIndex: number): void {
		this.selectionDetailsPane.innerText = '';
		const option = this.options[selectedIndex];
		const description = option?.description ?? '';
		const descriptionIsMarkdown = option?.descriptionIsMarkdown ?? false;

		if (description) {
			if (descriptionIsMarkdown) {
				const actionHandler = option.descriptionMarkdownActionHandler;
				this.selectionDetailsPane.appendChild(this.renderDescriptionMarkdown(description, actionHandler));
			} else {
				this.selectionDetailsPane.innerText = description;
			}
			this.selectionDetailsPane.style.display = 'block';
		} else {
			this.selectionDetailsPane.style.display = 'none';
		}

		// Avoid recursion
		this._skipLayout = true;
		this.contextViewProvider.layout();
		this._skipLayout = false;
	}