## 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
hasLegacyContext: boolean,
  
  context: Object | null,
  hooks: Object | null,
  props: Object | null,
  state: Object | null,
  
  owners: Array<Owner> | null,
  
  source: Source | null,
  type: ElementType,
|};
export const InspectElementFullDataType = 'full-data';
export const InspectElementNoChangeType = 'no-change';
export const InspectElementNotFoundType = 'not-found';
export const InspectElementHydratedPathType = 'hydrated-path';
type InspectElementFullData = {|
  id: number,
  type: 'full-data',
  value: InspectedElement,
|};
type InspectElementHydratedPath = {|
  id: number,
  type: 'hydrated-path',
  path: Array<string | number>,
  value: any,
|};
type InspectElementNoChange = {|
  id: number,
  type: 'no-change',