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

		this.webview?.focus();
		setTimeout(() => { // Need this, or focus decoration is not shown. No clue.
			this._sendMessageToWebview({
				type: 'focus-output',
				cellId,
			});
		}, 50);
	}