src/vs/workbench/contrib/notebook/browser/view/renderers/backLayerWebView.ts/BackLayerWebView/removeInsets
class BackLayerWebView:	removeInsets(outputs: readonly ICellOutputViewModel[]) {
		if (this._disposed) {
			return;
		}

		for (const output of outputs) {
			const outputCache = this.insetMapping.get(output);
			if (!outputCache) {
				continue;
			}

			const id = outputCache.outputId;

			this._sendMessageToWebview({
				type: 'clearOutput',
				rendererId: outputCache.cachedCreation.rendererId,
				cellUri: outputCache.cellInfo.cellUri.toString(),
				outputId: id,
				cellId: outputCache.cellInfo.cellId
			});
			this.insetMapping.delete(output);
			this.reversedInsetMapping.delete(id);
		}
	}