## 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
changeDescriptions: recordChangeDescriptions ? new Map() : null,
        durations: [],
        commitTime: getCurrentTime() - profilingStartTime,
        interactions: Array.from(root.memoizedInteractions).map(
          (interaction: Interaction) => ({
            ...interaction,
            timestamp: interaction.timestamp - profilingStartTime,
          }),
        ),
        maxActualDuration: 0,
        priorityLevel:
          priorityLevel == null ? null : formatPriorityLevel(priorityLevel),
      };
    }
    if (alternate) {
       T
      const wasMounted =
        alternate.memoizedState != null &&
        alternate.memoizedState.element != null;
      const isMounted =
        current.memoizedState != null && current.memoizedState.element != null;
      if (!wasMounted && isMounted) {
         M
        setRootPseudoKey(currentRootID, current);
        mountFiberRecursively(current, null, false, false);
      } else if (wasMounted && isMounted) {
         U
        updateFiberRecursively(current, alternate, null, false);
      } else if (wasMounted && !isMounted) {
         U