fix(reconcile): notify ownKeys subscribers on pure keyed trailing removal

[tsushanth]

When keyed reconcile removes only trailing items from an array (for example [{id:1},{id:2},{id:3}] shrinks to [{id:1},{id:2}]), the common-prefix loop advances start past all matching items, which causes start > newEnd to be true and the early-exit branch to execute

Inside that branch, the two inner loops only run when there are new or updated items to write — there are none in a pure removal — so changed stays false, notifySelf(target) is skipped, and any memo that subscribed to the array's ownKeys via $TRACK is never invalidated

The length signal fires correctly, but that is a separate signal; ownKeys subscribers (which createSelector, spread patterns, and anything using $TRACK depend on) are silently stale

The same path exists in both applyStateFast and applyStateSlow

Fix: widen the notifySelf guard to also fire when the array length changed, regardless of whether any element was rewritten in this pass

Fixes #2773

[changeset-bot]

🦋 Changeset detected

Latest commit: 54b2175

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 9 packages

Name	Type
@solidjs/signals	Patch
test-integration	Patch
solid-js	Patch
babel-preset-solid	Patch
@solidjs/web	Patch
@solidjs/html	Patch
@solidjs/h	Patch
@solidjs/universal	Patch
@solidjs/element	Patch

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[codspeed-hq]

Merging this PR will not alter performance

✅ 118 untouched benchmarks

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_{Comparing tsushanth:fix/reconcile-trailing-removal-notify (54b2175) with next (a4ca10b)}