## 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
useEffect(() => {
    if (selectedElementID === null) {
      return () => {};
    }
    const rendererID = store.getRendererIDForElement(selectedElementID);
    let timeoutID: TimeoutID | null = null;
    const sendRequest = () => {
      timeoutID = null;
      if (rendererID !== null) {
        bridge.send('inspectElement', {id: selectedElementID, rendererID});
      }
    };
    
    
    sendRequest();
    const onInspectedElement = (data: InspectedElementPayload) => {
      
      if (data.id === selectedElementID) {
        switch (data.type) {
          case 'no-change':
          case 'full-data':
          case 'hydrated-path':
            if (timeoutID !== null) {
              clearTimeout(timeoutID);
            }
            timeoutID = setTimeout(sendRequest, 1000);
            break;
          default:
            break;