## The current behavior

The full value of the `key` is very difficult / impossible to find and use in the interface of the React Devtools.

![Kapture 2020-04-22 at 11 47 47](https://user-images.githubusercontent.com/1935696/79997715-25222680-84ba-11ea-97ba-51f1679a8c91.gif)

Only managed to find it by accident :(

## The expected behavior

The `key` is visible in the props list to the right.

### Detailed Proposal

As mentioned below in https://github.com/facebook/react/issues/18702#issuecomment-617924196

Add a light divider and new section in the props panel to the right.

Potentially also add a question mark that shows an explanation about the fact that things in this section are not really props.

Ref (Original implementation): https://github.com/facebook/react-devtools/pull/328
props: copyWithSet(element.props, path, value),
      };
      forceUpdate(internalInstance._instance);
    }
  }
  function setInState(id: number, path: Array<string | number>, value: any) {
    const internalInstance = idToInternalInstanceMap.get(id);
    if (internalInstance != null) {
      const publicInstance = internalInstance._instance;
      if (publicInstance != null) {
        setIn(publicInstance.state, path, value);
        forceUpdate(publicInstance);
      }
    }
  }
  function setInContext(id: number, path: Array<string | number>, value: any) {
    const internalInstance = idToInternalInstanceMap.get(id);
    if (internalInstance != null) {
      const publicInstance = internalInstance._instance;
      if (publicInstance != null) {
        setIn(publicInstance.context, path, value);
        forceUpdate(publicInstance);
      }
    }
  }
  function setIn(obj: Object, path: Array<string | number>, value: any) {
    const last = path.pop();
    const parent = path.reduce(
      
      (reduced, attr) => (reduced ? reduced[attr] : null),