## 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
}
    } else {
      const {key} = fiber;
      const displayName = getDisplayNameForFiber(fiber);
      const elementType = getElementTypeForFiber(fiber);
      const {_debugOwner} = fiber;
      const ownerID =
        _debugOwner != null ? getFiberID(getPrimaryFiber(_debugOwner)) : 0;
      const parentID = parentFiber
        ? getFiberID(getPrimaryFiber(parentFiber))
        : 0;
      const displayNameStringID = getStringID(displayName);
       T
       i
      const keyString = key === null ? null : '' + key;
      const keyStringID = getStringID(keyString);
      pushOperation(TREE_OPERATION_ADD);
      pushOperation(id);
      pushOperation(elementType);
      pushOperation(parentID);
      pushOperation(ownerID);
      pushOperation(displayNameStringID);
      pushOperation(keyStringID);
    }
    if (isProfilingSupported) {
      idToRootMap.set(id, currentRootID);
      recordProfilingDurations(fiber);
    }
  }
  function recordUnmount(fiber: Fiber, isSimulated: boolean) {