## 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
NormalPriority,
    LowPriority,
    IdlePriority,
    NoPriority,
  } = ReactPriorityLevels;
  const {
    overrideHookState,
    overrideProps,
    setSuspenseHandler,
    scheduleUpdate,
  } = renderer;
  const supportsTogglingSuspense =
    typeof setSuspenseHandler === 'function' &&
    typeof scheduleUpdate === 'function';
  
  
  
  
  
  if (process.env.NODE_ENV !== 'test') {
    registerRendererWithConsole(renderer);
    
    
    
    if (window.__REACT_DEVTOOLS_APPEND_COMPONENT_STACK__ !== false) {
      patchConsole();
    }
  }
  const debug = (name: string, fiber: Fiber, parentFiber: ?Fiber): void => {
    if (__DEBUG__) {