## 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
if (element != null && element.props != null) {
        style = element.props.style || null;
      }
    }
    return {
      instance,
      style,
    };
  }
  function updateSelectedElement(id: number): void {
    const internalInstance = idToInternalInstanceMap.get(id);
    if (internalInstance == null) {
      console.warn(`Could not find instance with id "${id}"`);
      return;
    }
    switch (getElementType(internalInstance)) {
      case ElementTypeClass:
        global.$r = internalInstance._instance;
        break;
      case ElementTypeFunction:
        const element = internalInstance._currentElement;
        if (element == null) {
          console.warn(`Could not find element with id "${id}"`);
          return;
        }
        global.$r = {
          props: element.props,
          type: element.type,
        };
        break;