## Summary
We see recent bug reports like #25755 and #25769 for devtools. Whenever
a component uses hook `useEffect`, it triggers an error.
This was introduced in #25663 when we try to keep the `ReactFiberFlags`
numbers consistent with reconciler, in order to fix an issue with server
components.
However, the values of `ReactFiberFlags` in reconciler were actually
changed a while ago in
b4204ede66
We made this mistake because, although it's not mentioned in the
comment, `DidCapture` and `Hydrating` are actually used by DevTools
This caused
- the latest (not stable) react version is broken on devtools before
4.27.0 (but only in uncommon cases such server components)
- all earlier react versions are broken on latest devtools (4.27.0)
To keep most versions work, we need to revert the commit that changed
the `ReactFiberFlags` values
## How did you test this change?
1. add a `useEffect` in a component in the TodoList of the shell,
trigger the error in devtools
2. after change, the error is gone
## Summary
This PR is to fix a bug: an "element cannot be found" error when
hydrating Server Components
### The problem
<img width="1061" alt="image"
src="https://user-images.githubusercontent.com/1001890/201206046-ac32a5e3-b08a-4dc2-99f4-221dad504b28.png">
To reproduce:
1. setting up a vercel next.js 13 playground locally
https://github.com/vercel/app-playground
2. visit http://localhost:3000/loading
3. click "electronics" button to navigate to
http://localhost:3000/loading/electronics to trigger hydrating
4. inspect one of the skeleton card UI from React DevTools extension
### The root cause & fix
This bug was introduced in #22527. When syncing reconciler changes, the
value of `Hydrating` was copied from another variable `Visibility` (one
more zero in the binary number).
To avoid this kind of issue in the future, a new file `ReactFiberFlags`
is created following the same format of the one in reconciler, so that
it's easier to sync the number without making mistakes.
The reconciler fiber flag file is also updated to reflect which of the
flags are used in devtools
## How did you test this change?
I build it locally and the bug no longer exist on
http://localhost:3000/loading
Mengdi Chen
