## 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);
      }
       Any time an inspected element has an update,
       we should update the selected $r value as wel.
       Do this before dehyration (cleanForBridge).
      updateSelectedElement(mostRecentlyInspectedElement);
       Clone before cleaning so that we preserve the full data.
       This will enable us to send patches without re-inspecting if hydrated paths are requested.
       (Reducing how often we shallow-render is a better DX for function components that use hooks.)
      const cleanedInspectedElement = {...mostRecentlyInspectedElement};
      cleanedInspectedElement.context = cleanForBridge(
        cleanedInspectedElement.context,
        createIsPathWhitelisted('context', null),
      );
      cleanedInspectedElement.hooks = cleanForBridge(
        cleanedInspectedElement.hooks,
        createIsPathWhitelisted('hooks', 'hooks'),
      );
      cleanedInspectedElement.props = cleanForBridge(
        cleanedInspectedElement.props,
        createIsPathWhitelisted('props', null),
      );
      cleanedInspectedElement.state = cleanForBridge(
        cleanedInspectedElement.state,
        createIsPathWhitelisted('state', null),
      );
      return {
        id,
        type: 'full-data',