## 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
): RendererInterface {
  const {
    getDisplayNameForFiber,
    getTypeSymbol,
    ReactPriorityLevels,
    ReactTypeOfWork,
    ReactTypeOfSideEffect,
  } = getInternalReactConstants(renderer.version);
  const {NoEffect, PerformedWork, Placement} = ReactTypeOfSideEffect;
  const {
    FunctionComponent,
    ClassComponent,
    ContextConsumer,
    DehydratedSuspenseComponent,
    Fragment,
    ForwardRef,
    HostRoot,
    HostPortal,
    HostComponent,
    HostText,
    IncompleteClassComponent,
    IndeterminateComponent,
    MemoComponent,
    SimpleMemoComponent,
    SuspenseComponent,
    SuspenseListComponent,
  } = ReactTypeOfWork;
  const {
    ImmediatePriority,
    UserBlockingPriority,