## 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
Recursively unmount all roots.
    hook.getFiberRoots(rendererID).forEach(root => {
      currentRootID = getFiberID(getPrimaryFiber(root.current));
      unmountFiberChildrenRecursively(root.current);
      recordUnmount(root.current, false);
      currentRootID = -1;
    });
    applyComponentFilters(componentFilters);
     Reset psuedo counters so that new path selections will be persisted.
    rootDisplayNameCounter.clear();
     Recursively re-mount all roots with new filter criteria applied.
    hook.getFiberRoots(rendererID).forEach(root => {
      currentRootID = getFiberID(getPrimaryFiber(root.current));
      setRootPseudoKey(currentRootID, root.current);
      mountFiberRecursively(root.current, null, false, false);
      flushPendingEvents(root);
      currentRootID = -1;
    });
  }
   NOTICE Keep in sync with get*ForFiber methods
  function shouldFilterFiber(fiber: Fiber): boolean {
    const {_debugSource, tag, type} = fiber;
    switch (tag) {
      case DehydratedSuspenseComponent:
         T
         H
         a
         F
         h
        return true;