src/vs/workbench/contrib/notebook/browser/view/renderers/backLayerWebView.ts/BackLayerWebView/hideInset
class BackLayerWebView:	hideInset(output: ICellOutputViewModel) {
		if (this._disposed) {
			return;
		}

		const outputCache = this.insetMapping.get(output);
		if (!outputCache) {
			return;
		}

		this.hiddenInsetMapping.add(output);

		this._sendMessageToWebview({
			type: 'hideOutput',
			outputId: outputCache.outputId,
			cellId: outputCache.cellInfo.cellId,
		});
	}