## 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
<Source fileName={source.fileName} lineNumber={source.lineNumber} />
        )}
      </div>
      {isEnabledForInspectedElement && (
        <ContextMenu id="SelectedElement">
          {data => (
            <Fragment>
              <ContextMenuItem
                onClick={() => copyInspectedElementPath(id, data.path)}
                title="Copy value to clipboard">
                <Icon className={styles.ContextMenuIcon} type="copy" /> Copy
                value to clipboard
              </ContextMenuItem>
              <ContextMenuItem
                onClick={() => storeAsGlobal(id, data.path)}
                title="Store as global variable">
                <Icon
                  className={styles.ContextMenuIcon}
                  type="store-as-global-variable"
                />{' '}
                Store as global variable
              </ContextMenuItem>
              {viewAttributeSourceFunction !== null &&
                data.type === 'function' && (
                  <ContextMenuItem
                    onClick={() => viewAttributeSourceFunction(id, data.path)}
                    title="Go to definition">
                    <Icon className={styles.ContextMenuIcon} type="code" /> Go
                    to definition
                  </ContextMenuItem>