src/vs/workbench/contrib/notebook/browser/view/renderers/backLayerWebView.ts/BackLayerWebView/updateMarkupPreviewSelections
class BackLayerWebView:	async updateMarkupPreviewSelections(selectedCellsIds: string[]) {
		if (this._disposed) {
			return;
		}

		this._sendMessageToWebview({
			type: 'updateSelectedMarkupCells',
			selectedCellIds: selectedCellsIds.filter(id => this.markupPreviewMapping.has(id)),
		});
	}