reobserve elements when children change (#54827)

packages/grafana-ui/src/components/ToolbarButton/ToolbarButtonRow.tsx

@@ -57,7 +57,7 @@ export const ToolbarButtonRow = forwardRef<HTMLDivElement, Props>(
         });
       }
       return () => intersectionObserver.disconnect();
-    }, []);
+    }, [children]);
 
     return (
       <div ref={containerRef} className={cx(styles.container, className)} {...rest}>