## 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
const isCurrent = isMostRecentlyInspectedElementCurrent(id);
    if (isCurrent) {
      copyToClipboard(
        getInObject(
          ((mostRecentlyInspectedElement: any): InspectedElement),
          path,
        ),
      );
    }
  }
  function inspectElement(
    id: number,
    path?: Array<string | number>,
  ): InspectedElementPayload {
    const isCurrent = isMostRecentlyInspectedElementCurrent(id);
    if (isCurrent) {
      if (path != null) {
        mergeInspectedPaths(path);
        let secondaryCategory = null;
        if (path[0] === 'hooks') {
          secondaryCategory = 'hooks';
        }
         If this element has not been updated since it was last inspected,
         we can just return the subset of data in the newly-inspected path.
        return {
          id,
          type: 'hydrated-path',
          path,
          value: cleanForBridge(
            getInObject(