## 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
shouldResetChildren = true;
            }
             H
             t
             i
            if (prevChild !== prevChildAtSameIndex) {
              shouldResetChildren = true;
            }
          } else {
            mountFiberRecursively(
              nextChild,
              shouldIncludeInTree ? nextFiber : parentFiber,
              false,
              traceNearestHostComponentUpdate,
            );
            shouldResetChildren = true;
          }
           T
          nextChild = nextChild.sibling;
           A
           k
          if (!shouldResetChildren && prevChildAtSameIndex !== null) {
            prevChildAtSameIndex = prevChildAtSameIndex.sibling;
          }
        }
         I
        if (prevChildAtSameIndex !== null) {
          shouldResetChildren = true;
        }
      } else {