LibWeb: Preserve cascade order for cached prefix answers - #11147
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Included review availability: Your plan includes up to 10 reviews per rolling hour; 8 remain after this review. 📝 WalkthroughWalkthroughThe CSS style matcher now orders cached published and document-scope prefix answers in cascade order. Streaming uses materialized published answers. Identity-only answers fall back to materialization when required. Regression tests cover cold matching, publication, materialized consumption, streamed consumption, and cache statistics. Sequence Diagram(s)sequenceDiagram
participant StyleMatcher
participant PrefixCache
participant Consumer
StyleMatcher->>PrefixCache: retrieve cached prefix answers
PrefixCache-->>StyleMatcher: return published or identity-only answers
StyleMatcher->>StyleMatcher: restore cascade order
StyleMatcher->>Consumer: materialize and stream ordered answers
Possibly related PRs
Merge Risk: 🟡 Moderate · up to Cached document-scope style results can still apply CSS rules in the wrong cascade order, allowing a less-specific rule to override a more-specific rule until the cache is invalidated. The current head is not merge-ready until this ordering issue is fixed or explicitly accepted by the owner. 🚥 Pre-merge checks | ✅ 3✅ Passed checks (3 passed)
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Actionable comments posted: 1
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Inline comments:
In `@Libraries/LibWeb/Rust/src/css/style/matching.rs`:
- Around line 3862-3863: Ensure document-scope identity-only cache answers are
ordered before consumption, not only the local matches vector in
order_matches_in_cascade. Apply the cascade ordering at the final
catalog-consumption boundary used by StyleEngine::consume_published_match_answer
and StyleEngine::consume_published_match_answer_with, or preserve an ordered
payload for compact_answer; extend regression coverage through
StyleEngine::complete_published_match_answer and both consumption APIs.
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ℹ️ Review info
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Configuration used: Organization UI
Review profile: CHILL
Plan: Pro Plus
Run ID: c50b002a-45b7-4226-9d01-9022e8ffc37b
📒 Files selected for processing (2)
Libraries/LibWeb/Rust/src/css/style/matching.rsLibraries/LibWeb/Rust/src/css/style/tests.rs
Prefix-cache answers use canonical rule-identity order for storage. A document-scope hit could expose storage order instead of cascade order, allowing a less-specific rule to override a more-specific rule. Order materialized cache hits before returning them. Identity-only published answers may lack a shared ordered payload, so restore cascade order when materializing those answers at the consumption boundary. Keep the zero-copy shared-payload path and allocation-free capacity probe. Cover direct cache hits and identity-only publication with vector and streaming consumers, including an undersized-buffer retry.
1 participant
Cached prefix answers are stored canonically by rule identity. When a document-scope cache hit rematerialized that payload, it returned the storage order directly even though callers require cascade order. It can let a less specific rule override a more specific rule until another invalidation forces exact matching.
Restore cascade ordering after rematerialization and cover cache misses and hits with differing specificity.