* Don't show "context" for classes without either contextType or contextTypes
* For classes with contextTypes, change the label to "legacy context" instead

---
Originally reported by @gaearon via https://github.com/bvaughn/react-devtools-experimental/issues/368
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);
      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;