We shouldn't continue executing async work where we know the surrounding branch is destroyed already, it can leave to noisy "derived inter" warnings or even runtime errors ("cannot stringify symbol" when running a template effect with an uninitialized source). Neither should we warn about waterfalls on an already-destroyed async effect.

Fixes #18097 (though strictly speaking that particular instance is also fixed by #18117 which fixes the underlying cause for the reruns; this one is necessary in itself though, as shown by the new test)

This is a regression from #18117 - we moved `this.#commit()` higher up
but that means that `current_batch` could be nulled out / overridden
through `batch.activate/deactivate` / blocker runs inside `#commit()`.
Therefore restore the previous value afterwards. No changest because
#18117 is not released yet.
Fixes the other part of the failing SvelteKit `query.live` test.

---------

Co-authored-by: Rich Harris <rich.harris@vercel.com>

We shouldn't continue executing async work where we know the surrounding
branch is destroyed already, it can leave to noisy "derived inter"
warnings or even runtime errors ("cannot stringify symbol" when running
a template effect with an uninitialized source). Neither should we warn
about waterfalls on an already-destroyed async effect.

Fixes #18097 (though strictly speaking that particular instance is also
fixed by #18117 which fixes the underlying cause for the reruns; this
one is necessary in itself though, as shown by the new test)

---------

Co-authored-by: Rich Harris <rich.harris@vercel.com>

This PR was opened by the [Changesets
release](https://github.com/changesets/action) GitHub action. When
you're ready to do a release, you can merge this and the packages will
be published to npm automatically. If you're not ready to do a release
yet, that's fine, whenever you add more changesets to main, this PR will
be updated.


# Releases
## svelte@5.55.6

### Patch Changes

- fix: leave stale promises to wait for a later resolution, instead of
rejecting ([#18180](#18180))

- fix: keep dependencies of `$state.eager/pending`
([#18218](#18218))

- fix: reapply context after transforming error during SSR
([#18099](#18099))

- fix: don't rebase just-created batches
([#18117](#18117))

- chore: allow `null` for `pending` in typings
([#18201](#18201))

- fix: flush eager effects in production
([#18107](#18107))

- fix: rethrow error of failed iterable after calling `return()`
([#18169](#18169))

- fix: account for proxified instance when updating `bind:this`
([#18147](#18147))

- fix: ensure scheduled batch is flushed if not obsolete
([#18131](#18131))

- fix: resolve stale deriveds with latest value
([#18167](#18167))

- chore: remove unnecessary `increment_pending` calls
([#18183](#18183))

- fix: correctly compile component member expressions for SSR
([#18192](#18192))

- fix: reset `source.updated` stack traces after `flush`
([#18196](#18196))

- fix: replacing async 'blocking' strategy with 'merging'
([#18205](#18205))

- fix: allow `@debug` tags to reference awaited variables
([#18138](#18138))

- fix: re-run fallback props if dependencies update
([#18146](#18146))

- fix: abort running obsolete async branches
([#18118](#18118))

- fix: ignore comments when reading CSS values
([#18153](#18153))

- fix: wrap `Promise.all` in `save` during SSR
([#18178](#18178))

- fix: ignore false-positive errors of `$inspect` dependencies
([#18106](#18106))

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>