chore(examples): useCallback for useOnViewport handlers

packages/core/src/hooks/useOnViewportChange.ts

@@ -17,6 +17,7 @@ function useOnViewportChange({ onStart, onChange, onEnd }: UseOnViewportChangeOp
   }, [onStart]);
 
   useEffect(() => {
+    console.log('change onchange');
     store.setState({ onViewportChange: onChange });
   }, [onChange]);
 

packages/core/src/styles/init.css

@@ -44,6 +44,7 @@
 .react-flow__connection-path {
   stroke: #b1b1b7;
   stroke-width: 1;
+  fill: none;
 }
 
 .react-flow__edge {