Modified <ListWidget> rendering logic to use item ID rather than array index as the React key for the items listing, as an item's array index can change, while the ID will remain constant throughout its lifetime.

Author: maratbn

webpack_in/entry.jsx

@@ -109,7 +109,7 @@ class ListWidget extends React.Component {
             <div style={ objStyleCommon }>
               <div style={ objStyleContent }>
                 <ul style={{ display: 'inline-block', textAlign: 'left' }}>
-                  { this.state.items.map((objItem, index) => (<li key={ index }>
+                  { this.state.items.map((objItem, index) => (<li key={ objItem.id }>
                                                                 { objItem.caption }
                                                               </li>)) }
                 </ul>