## 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
tag === SimpleMemoComponent ||
        tag === ForwardRef) &&
      (!!memoizedState || !!dependencies);
    const typeSymbol = getTypeSymbol(type);
    let canViewSource = false;
    let context = null;
    if (
      tag === ClassComponent ||
      tag === FunctionComponent ||
      tag === IncompleteClassComponent ||
      tag === IndeterminateComponent ||
      tag === MemoComponent ||
      tag === ForwardRef ||
      tag === SimpleMemoComponent
    ) {
      canViewSource = true;
      if (stateNode && stateNode.context != null) {
         D
        const shouldHideContext =
          elementType === ElementTypeClass &&
          !(type.contextTypes || type.contextType);
        if (!shouldHideContext) {
          context = stateNode.context;
        }
      }
    } else if (
      typeSymbol === CONTEXT_NUMBER ||
      typeSymbol === CONTEXT_SYMBOL_STRING
    ) {