Merge pull request #1520 from syranide/ediblechildren

Warn against contentEditable with children props

src/browser/ui/ReactDOMComponent.js

@@ -60,6 +60,16 @@ function assertValidProps(props) {
     props.children == null || props.dangerouslySetInnerHTML == null,
     'Can only set one of `children` or `props.dangerouslySetInnerHTML`.'
   );
+  if (__DEV__) {
+    if (props.contentEditable && props.children != null) {
+      console.warn(
+        'A component is `contentEditable` and contains `children` managed by ' +
+        'React. It is now your responsibility to guarantee that none of those '+
+        'nodes are unexpectedly modified or duplicated. This is probably not ' +
+        'intentional.'
+      );
+    }
+  }
   invariant(
     props.style == null || typeof props.style === 'object',
     'The `style` prop expects a mapping from style properties to values, ' +