fix: don't reexecute derived with no dependencies on teardown #16438
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The prior logic was wrong because it reexecuted when something was clean, but we want to when it's not. The remaining fix was to also check the reactions: If an effect is destroyed and it was the last reaction of a derived then the derived is set to `MAYBE_DIRTY`. We therefore also need to check if the derived still has anyone listening to it, and only then reexecute it. Fixes #16363
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The prior logic was wrong because it reexecuted when something was clean, but we want to when it's not. The remaining fix was to also check the reactions: A derived is set to
MAYBE_DIRTYif it doesn't have any reactions anymore as a result of e.g. an effect that listened to it tearing down. We don't want to rerun in that case.Fixes #16363
Before submitting the PR, please make sure you do the following
feat:,fix:,chore:, ordocs:.packages/svelte/src, add a changeset (npx changeset).Tests and linting
pnpm testand lint the project withpnpm lint