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Pieter De Baets 00f48cecfc [flags] Cleanup enableFragmentRefs feature flag (#37573)
## Summary

`enableFragmentRefs` is enabled in every channel, so this inlines the
enabled branch and removes the flag from `ReactFeatureFlags` and all of
its forks.

Most of the diff is mechanical, but a few spots needed care:

- Several `case Fragment:` blocks in `ReactFiberCommitWork` had a `//
Fallthrough` that was only reachable with the flag off. Where a
preceding case falls *into* `Fragment` (the `ViewTransitionComponent`
cases), I verified the resulting behavior is unchanged for every
remaining flag combination.
- `commitAttachRef` in `ReactFiberCommitEffects` becomes a plain `case
Fragment: { ... break; }` instead of a conditional fallthrough into
`default`.
- The `React.Fragment` invalid-prop warning no longer has two variants;
it always mentions `key`, `ref`, and `children`.

The three related flags — `enableFragmentRefsScrollIntoView`,
`enableFragmentRefsInstanceHandles`, and `enableFragmentRefsTextNodes` —
are *not* on everywhere yet and are left in place.

In tests, `enableFragmentRefs` was stripped from 101 `@gate` pragmas.
Combined gates such as `@gate enableFragmentRefs &&
enableFragmentRefsTextNodes` were reduced rather than removed. One test
asserted the absence of a warning under the flag, so it was renamed from
`warns for fragments with refs` to `does not warn for fragments with
refs`.

## How did you test this change?

`yarn lint`, `yarn prettier-check`, and `yarn flow` for `dom-node`,
`dom-browser`, and `fabric` all pass.

Full test suite run across `experimental`, `stable`, `www-modern`,
`www-classic`, and `xplat`, with both `--variant` settings, plus
`--persistent`. The remaining failures (Fizz / Flight / FrameScheduling
/ ClassEquivalence) are pre-existing: I diffed the individual failing
test names against the base commit and they are identical.
2026-09-10 19:24:21 +02:00
..