## 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
SuspenseListComponent: WorkTag,
  YieldComponent: WorkTag,
|};
export type FiberData = {|
  key: string | null,
  displayName: string | null,
  type: ElementType,
|};
export type NativeType = Object;
export type RendererID = number;
type Dispatcher = any;
export type CurrentDispatcherRef = {|current: null | Dispatcher|};
export type GetDisplayNameForFiberID = (
  id: number,
  findNearestUnfilteredAncestor?: boolean,
) => string | null;
export type GetFiberIDForNative = (
  component: NativeType,
  findNearestUnfilteredAncestor?: boolean,
) => number | null;
export type FindNativeNodesForFiberID = (id: number) => ?Array<NativeType>;
export type ReactProviderType<T> = {
  $$typeof: Symbol | number,
  _context: ReactContext<T>,
  ...
};
export type ReactRenderer = {
  findFiberByHostInstance: (hostInstance: NativeType) => ?Fiber,
  version: string,
  bundleType: BundleType,