## 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
let fiber = idToFiberMap.get(id);
    if (fiber == null) {
      return null;
    }
    const keyPath = [];
    while (fiber !== null) {
      keyPath.push(getPathFrame(fiber));
      fiber = fiber.return;
    }
    keyPath.reverse();
    return keyPath;
  }
  function getBestMatchForTrackedPath(): PathMatch | null {
    if (trackedPath === null) {
       N
      return null;
    }
    if (trackedPathMatchFiber === null) {
       W
      return null;
    }
     Find the closest Fiber store is aware of.
    let fiber = trackedPathMatchFiber;
    while (fiber !== null && shouldFilterFiber(fiber)) {
      fiber = fiber.return;
    }
    if (fiber === null) {
      return null;
    }
    return {