## 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
key: number | string | null,
  hocDisplayNames: null | Array<string>,
  // 
  isCollapsed: boolean,
  // 
  ownerID: number,
  // 
  // 
  depth: number,
  // 
  // 
  // 
  weight: number,
|};
export type Owner = {|
  displayName: string | null,
  id: number,
  hocDisplayNames: Array<string> | null,
  type: ElementType,
|};
export type OwnersList = {|
  id: number,
  owners: Array<Owner> | null,
|};
export type InspectedElement = {|
  id: number,
  // 
  canEditHooks: boolean,
  // 
  canEditFunctionProps: boolean,