## 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
if (path != null) {
      mergeInspectedPaths(path);
    }
    
    
    
    updateSelectedElement(id);
    inspectedElement.context = cleanForBridge(
      inspectedElement.context,
      createIsPathWhitelisted('context'),
    );
    inspectedElement.props = cleanForBridge(
      inspectedElement.props,
      createIsPathWhitelisted('props'),
    );
    inspectedElement.state = cleanForBridge(
      inspectedElement.state,
      createIsPathWhitelisted('state'),
    );
    return {
      id,
      type: 'full-data',
      value: inspectedElement,
    };
  }
  function inspectElementRaw(id: number): InspectedElement | null {
    const internalInstance = idToInternalInstanceMap.get(id);
    if (internalInstance == null) {
      return null;
    }