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

		const cellsToHide: string[] = [];
		for (const cellId of cellIds) {
			const entry = this.markupPreviewMapping.get(cellId);
			if (entry) {
				if (entry.visible) {
					cellsToHide.push(cellId);
					entry.visible = false;
				}
			}
		}

		if (cellsToHide.length) {
			this._sendMessageToWebview({
				type: 'hideMarkupCells',
				ids: cellsToHide
			});
		}
	}