[TimotheusG]

Dependencies and merge order

Proposed landing position 7. Actual stacked prerequisite: #1890. Also land #1907 first in the proposed sequence, then update this branch to combine the captured locale and database revision in the family-cache key and adapt the concurrent-registration test calls. #1907 is a coordinated integration requirement, not a prerequisite for this feature to work independently. We own that branch update; the resolution is already saved in the tested combined tree.

Full nine-PR index, merge instructions, audited heads and validation evidence. The first five positions are independent, not a serial dependency chain. Combined CI evidence is not a claim of nine standalone full-suite passes.

Text already laid out with a substitute font kept the substitute's glyphs and missing-font flag after the original font was registered. Include the append-only font database revision in the layout cache key so the next identical layout request uses the newly registered font.

This follow-up is stacked on #1890; merge that prerequisite first. The cache defect reproduces on the common base too, so it was not introduced by #1890's test-isolation change.

Synthetic-font regressions cover fallback-to-original registration, the nine metric aliases, original-family precedence, styles, names, variable instances and isolated concurrent face lists. The change adds one database read and retains bounded cache eviction.

Validation:

• Standalone text crate: 67 tests passed, none failed or ignored; strict Clippy and formatting passed.
• With fix(text): isolate CJK fallback language and cache entries #1907's CJK companion: 68 tests passed.
• One coordinated cargo xtask ci passed on the exact combined companion tree b6d9dfbae430320d08db268332e366129af03709: 3,693 passed, zero failed, 41 explicitly recorded ignored checks; formatting, strict workspace Clippy, PDF policy, layers, 39 asset checks and 32-crate WASM check passed. Source and lockfile were verified unchanged afterward.

The combined gate used pinned heads of #1827, #1889, #1890, #1891, #1907, #1915, #1916 and #1922, plus the frozen font/audio follow-ups and CI tooling. It is combined-integration evidence, not a claim that this standalone PR passed the whole repository gate. Hosted platform checks and fresh automated review remain pending.

Credit: @TimotheusG.

Summary by CodeRabbit

• Bug Fixes
  • Improved font matching for family names, aliases, fallback fonts, and variable-font instances.
  • Improved handling of missing fonts while preserving preferred original-family matches.
  • Corrected text layout caching so rendered results update when available fonts change.
  • Refreshed fallback results after fonts are registered.
  • Improved consistency for glyph layout across different font-resolution scenarios.
• Tests
  • Expanded coverage for font aliases, fixed font selections, variable instances, missing fonts, cache invalidation, and concurrent access.

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• crates/text/src/fonts.rs

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• crates/text/src/fonts.rs

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📝 Walkthrough

Font registration now refreshes family and fallback caches. Font resolution evaluates matches against explicit face lists. Fallback and layout caches include the font database revision. Tests cover isolated, concurrent, alias, variable-instance, and registration behavior.

Changes: Font Resolution and Cache Revision

Layer / File(s)	Summary
Refresh caches after font registration crates/text/src/fonts.rs	Registration releases the database lock before cache invalidation. Family and fallback caches clear after registration. Cache keys use the database revision. Tests cover registration races and cached fallback misses.
Resolve fonts from explicit face lists crates/text/src/fonts.rs	Family, name, alias, fallback, and variable-instance resolution use supplied face lists. Tests cover aliases, styles, missing families, precedence, variable instances, sparse IDs, and concurrent fixed-list resolution.
Include revisions in layout cache keys crates/text/src/layout.rs	layout_rich includes the font database revision in its cache key.

Priority: ⬇️ Low

Estimated code review effort: 4 (Complex) | ~45 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to ca7cb

Font registration now invalidates the affected caches, and the inspected layout path preserves the revision ordering. No merge-blocking issue remains in the reviewed changes.

Security architecture risk: 🔵 Low · up to 22737

The change improves font-cache freshness without adding an external interface or new privileges. No introduced security issue was established. Remaining uncertainty concerns concurrent registration, interrupted cache refresh, and how applications expose font registration.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The evidenced propagation scope is the hosting process: a caller already able to register fonts can affect subsequent font resolution and layouts sharing that database. The inspected database and cache identities contain no project or tenant partition. Whether applications share this process across trust domains remains unestablished.

Trust Boundaries and Controls

• observed — Inputs remain caller-supplied font bytes or FontSource metadata and text family/style values. Explicit-face helpers constrain matching to a supplied collection, but are private implementation functions rather than a new authorization or tenant-isolation boundary. Production resolution still obtains collections from the shared database.

Resilience and Maintainability Implications

• observed — Registration explicitly drops the database write guard before acquiring cache write locks, avoiding the inspected reverse ordering with fallback-cache readers that access faces. Layout cache growth remains bounded by eviction at 512 entries; this is an entry-count limit, not a byte-memory bound.

Pre-merge checks: 5

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly describes the main change: refreshing cached text layouts after font registration.
Docstring Coverage		Docstring coverage is 92.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 25 functions across 2 files.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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🟡 Minor · Clear fallback_cache() when a font is registered. Otherwise a cached "no… · fonts.rs:337-344

crates/text/src/fonts.rs:337-344
🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win

Clear fallback_cache() when a font is registered. Otherwise a cached "no fallback" result persists after registration.

add_font_data and add_source clear family_faces_cache(). They do not clear fallback_cache(). database_revision() now forces layout_rich to rebuild layouts after registration. The rebuilt layout still calls fonts::fallback_for, and that function returns stale cached results.

Trigger:

1. Text contains a character with script FallbackScript::Other, for example a private-use or symbol character. No current face covers the character.
2. system_fallback returns None. fallback_for caches None under (c >> 8, prefer).
3. The user calls add_font_data with a font that covers the character.
4. The new face is not checked in the "loaded already" step, because its bytes OnceLock is still empty.
5. The cache hit returns prefer.

Consequence: the rebuilt layout still renders the missing glyph. This defeats the PR objective of refreshing layouts after registration.

Fix: clear fallback_cache() in both registration functions.

Proposed fix

 pub fn add_font_data(data: Vec<u8>) -> Vec<FaceId> {
     let data = Arc::new(data);
     let names = read_faces_bytes(&data);
     let mut d = db().write().unwrap_or_else(|e| e.into_inner());
     let ids = names.into_iter().map(|n| push(&mut d, info_from(n, FaceData::Shared(data.clone()), "user"))).collect();
     family_faces_cache().write().unwrap_or_else(|e| e.into_inner()).clear();
+    fallback_cache().write().unwrap_or_else(|e| e.into_inner()).clear();
     ids
 }

Apply the same change in add_source after family_faces_cache() is cleared.

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Review comment at @crates/text/src/fonts.rs around lines 337 - 344:
Clear fallback_cache() in both add_font_data and add_source after clearing
family_faces_cache(), so fallback_for does not reuse stale cached misses after
font registration.

---

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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Outside diff comments:
Review comments at @crates/text/src/fonts.rs:
- Around line 337-344: Clear fallback_cache() in both add_font_data and
add_source after clearing family_faces_cache(), so fallback_for does not reuse
stale cached misses after font registration.

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[TimotheusG]

Addressed the fallback-cache feedback in 2273721. Both font-registration paths invalidate fallback results, and revisioned cache keys prevent an in-flight old search from restoring a stale miss. The reproduction failed before the fix for both registration paths; the font owner reports 68 tests passing with no ignores.

The bundled companion-PR candidate passed cargo xtask ci: 3,718 passed, 0 failed, 33 ignored; formatting, strict all-targets Clippy, policy checks, and WASM (32 crates) passed. This is one combined full-suite run.

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Inline comments:
Review comments at @crates/text/src/fonts.rs:
- Around line 334-336: Update family_faces_cache and family_faces so cache keys
include the current database_revision(). Read the revision before resolving the
face list and use the same revision-qualified key for lookup and insertion,
preventing lists built from stale all_faces() snapshots from being reused after
registration.

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[TimotheusG]

Addressed in ca7cbd7. Family fallback cache lookup and insertion now use the same database revision captured before resolving faces. A controlled two-thread test reproduces the stale insertion after registration on the prior head, then passes with this fix and selects the preferred newly registered font.

All 20 focused font tests passed. The frozen combined companion-PR candidate also passed cargo xtask ci: 3,721 passed, 0 failed, 33 ignored; strict all-targets Clippy, formatting, policies and WASM (32 crates) passed.

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