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fix(mobile): chat code blocks colour diff, kotlin, sql and other languages again - #33680
On mobile, chat code fences in languages that react-native-enriched-markdown cannot colour render as plain grey text: ```diff (added and removed lines uncoloured), and kotlin, sql, swift, ruby, dart and others. Web colours the same message. Chat markdown moved to enriched-markdown in https://git.cafe/pingdotgg/t3code/pulls/16979; its tree-sitter highlighter only compiles 14 default grammars, while the app's own highlighter (@pierre/highlights, already used by the work log and review comments) coloured every fence before.
Change
codeBlockElement (apps/mobile/src/native/EnrichedMarkdownText.tsx), the existing renderers.code seam that already swaps Mermaid and math fences, now asks codeFenceRenderer (codeBlockMarkdown.ts) which renderer a fence gets: Mermaid, math (when enabled), the app highlighter, or the native block. Mermaid and math are decided first, because the highlighter also knows mermaid. Natively coloured languages (the CodeBlockLanguages.cpp entries with a default grammar), unknown languages and fences without a language keep the native block.
HighlightedCodeBlock.tsx draws the fallback with useMarkdownCodeHighlight, the code block's own font, size and colours, a language header, the wrap toggle (unwrapped scrolls horizontally) and the copy button. Like the native block, its code is not selectable and a long-press opens Copy / Copy as Markdown; Copy as Markdown fences the code with more backticks than any run inside it.
CodeBlockFrame.tsx is the frame and header the Mermaid block already drew, extracted so both share it. Its header now has a minimum height instead of a fixed one, so at large text sizes the label grows instead of being clipped (Mermaid headers included); at the default size it is unchanged.
Android's in-window menu (used while the keyboard is open) placed itself above or below its anchor; with an anchor taller than the visible area its height went negative and the menu landed off-screen. Vertical placement is now deriveMenuVerticalPlacement beside the horizontal one; anchors with room open as before, otherwise the menu overlaps the anchor inside the keyboard-free area.
Limit: enriched-markdown exposes no renderer slot for fences nested inside list items, so those keep the native rendering (and stay uncoloured for these languages).
Tests: codeBlockMarkdown.test.ts pins which renderer each fence gets (mermaid before the highlighter, math on/off, upper-case, native, text, empty) and the Markdown-copy fence; menu-placement.test.ts pins the off-screen case (anchor taller than the keyboard-free area) and the unchanged open-down/open-up cases. Focused runs pass (codeBlockMarkdown, menu-placement, highlights, highlightLanguage, React Compiler coverage). vp run check:changed passes; knip shard 2 hit the runner's 900 s timeout once under load, and the full knip:check passed in the commit hook.
Real dev clients from each checkout, each against its own fresh dev server (T3CODE_DEV_SEED=0), same synthetic replies sent through the server RPC and a replayed agent stream. Before = main at merge-base 633438d54f. After: colour stills at 0f0c652771, interaction recordings at 63069af964/c6afa44bc6, large text and streaming at the final head 06c360d934. Commits between them change only Android menu placement, the code scroller's keyboard handling and the header's minimum height; the header change is pixel-identical at default text size (check).
Android: pooled Pixel 9, Android 16 / API 36, 1080×2424, OS font scale 1.0, app text 16 (source default). iOS: pooled iPhone 18 Pro, iOS 27.2 (pool catalog), 1206×2622, 402×874 logical, DPR 3, default text size. T3 Code palette. Clocks not frozen (Android status bar normalised to 9:41). Stills accepted only after two pixel-identical screenshots ≥500 ms apart; Diff0 = ImageMagick 0% fuzz (any change white), DiffT = 2% fuzz.
Each sheet is Before | After | Diff0 | DiffT, whole screen (clocks and timestamps differ); code-block-only crops of every pair, aligned on each block's header, are in pass 3.
C1 — diff, Kotlin and native TypeScript fences
Android
iOS
Light
Dark
C2 — Swift, Dart, Ruby, SQL, C++ (Android dark), R1 — Kotlin in a review card, M4 — mermaid stays a diagram, MERMAID becomes coloured code, math off stays native
S1 — 400-line diff reply, Android, 3 alternating trials per side at 60 Hz, frame stats from reset before send to the settled block (table, before, after): mean janky frames 57.8% on main and 58.8% on this branch, with overlapping ranges; no clear jank-rate increase was resolved, which does not establish equivalence. The largest frame times among the tool's three selected worst windows per trial were 266.8/77.2/135.0 ms on main versus 583.9/1076.9/1183.6 ms on this branch: every trial here was worse on this tail metric around final rendering. These are selected-window maxima on a debug emulator, not verified global worst frames; the cause is unprofiled.
What else changed
Fallback blocks use the app highlighter's palette, not the native GitHub-style one, so a message with a TypeScript and a Kotlin fence shows two token palettes. Header glyphs, frame border, padding and line pitch differ from the native block, so block heights change and bottom-anchored content above moves.
Rendering a long fallback fence shows a worse worst-frame time than the native block (S1 above); the cause is unprofiled.
On Android the long-press menu on a fallback block is the app's own menu (dark in the dark theme), not the native block's white system menu, and is placed by it.
Upper-case MERMAID fences (never diagrams) now render as coloured code instead of plain native code.
Message timestamps, iOS status clocks and the iOS translucent header backdrop differ between sides; zero-threshold diffs are not frozen-clock comparisons. C2's after frame is panned 100 px to show all six headers.
Not verified
A fence growing inside one message: the app shows a streamed reply's fence body only near completion, on main and on this branch alike, so growth and wrap state within one growing fence cannot be observed (wrap state across messages is kept: before, after).
At the largest text size: a narrow block with a long language label, and horizontal pan after Copy (vertical clipping is fixed and shown in T1).
The keyboard-open overlap placement on a device: a long-press closes Gboard first on Android, as on main (K1); covered by menu-placement.test.ts.
Recordings for math off/on/off, a streaming Mermaid fence, Mermaid source/fullscreen and cold cache, the Markdown file preview and pending-question cards (code paths unchanged; renderer order is unit-tested); physical devices; fences inside list items (known limit).
…uages again
Since chat markdown moved to react-native-enriched-markdown, fences in
languages outside its default tree-sitter grammars (diff, kotlin, sql,
swift, ruby, dart, ...) render as plain text on mobile, while web colours
them.
Once such a fence closes, the code renderer now draws it with the app's
own highlighter in a block that copies the native one: language header,
wrap toggle, copy button, and the code block's font and colours. Natively
coloured, unknown, unlabelled and still-streaming fences keep the native
block. The Mermaid block shares the same frame and header.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…eams
The highlighted fallback now renders from the opening fence, with
highlighting deferred until the fence closes, so a wrap toggle and the
block's height carry across completion instead of swapping blocks.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Macroscope's review found this PR approvable — Restores syntax colouring for additional mobile chat code languages, preserves copy and wrap controls, and improves Android menu positioning. The changes remain local presentation and interaction updates with no material data or operational exposure.
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Walkthrough
Mobile Markdown rendering adds highlighted code blocks for eligible fences, with language labels, wrapping controls, and copy actions. Mermaid blocks use a shared code-block frame and header buttons.
Changes: Mobile code blocks
Layer / File(s)
Summary
Shared frame and Mermaid integration apps/mobile/src/native/CodeBlockFrame.tsx, apps/mobile/src/native/MermaidCodeBlock.tsx
A shared frame and accessible header buttons provide the code-block layout. Mermaid blocks use them for their existing toggle and copy actions.
The renderer resolves eligible fence languages and displays token colors when a block is complete. It provides wrapping and copy actions. Fenced Markdown uses a delimiter longer than any backtick run in the code; tests cover language labels and embedded backticks.
sequenceDiagram
participant EnrichedMarkdownText
participant fallbackHighlightLanguage
participant HighlightedCodeBlock
EnrichedMarkdownText->>fallbackHighlightLanguage: Resolve fence language
fallbackHighlightLanguage-->>EnrichedMarkdownText: Return mapped language or null
EnrichedMarkdownText->>HighlightedCodeBlock: Pass code, scheme, and completion state
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Possibly related issues
pingdotgg/t3code#9661 — This change waits for a fence to close before enabling highlighting. It does not cover the broader streaming performance work described by the issue.
Possibly related PRs
pingdotgg/t3code#24544 — This change uses the mobile highlightCode API and HighlightScheme added by that PR.
Suggested labels:📱 Native Change
Suggested reviewers:t3dotgg
Merge Risk: Minimal · previous review 25fea
The investigated highlighting and copy paths show no material new failure; the change is mergeable after normal checks.
Pre-merge checks: 3 · 1
Failed checks: 1 warning
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Description check
The description explains the problem and change and provides detailed verification. However, the Scope and approval section links the issue and says it was triaged through an automated flow, but it do…
Add a link to the triaged issue or discussion and identify the maintainer comment that explicitly approves the direction and scope. If no approval is required, explain why this qualifies as a very small, focused fix of an obvious bug; the c…
Passed checks: 3 passed
Check name
Status
Explanation
Title check
The title clearly identifies the mobile code-block color fix and names the affected languages.
Linked Issues check
Issue [#33638] requests colored diff and unsupported-language code fences in mobile chat. EnrichedMarkdownText.tsx routes fences that enriched-markdown does not color to HighlightedCodeBlock; th…
Out of Scope Changes check
All changes support [#33638]. CodeBlockFrame shares the existing Mermaid frame with the fallback renderer. Wrap, copy, and copy-as-Markdown controls support the replacement code-block UI. The Markdo…
Full details: Linked Issues check
Explanation
Issue [#33638] requests colored diff and unsupported-language code fences in mobile chat. EnrichedMarkdownText.tsx routes fences that enriched-markdown does not color to HighlightedCodeBlock; that component uses resolveHighlightLanguage and useMarkdownCodeHighlight. The native-language and unknown-language checks preserve existing rendering. The PR reports passing type, lint, compiler, and 1,068 automated tests. Nested-list fences remain native because the library has no renderer slot there; this does not affect the issue's standalone-fence reproduction.
Full details: Out of Scope Changes check
Explanation
All changes support [#33638]. CodeBlockFrame shares the existing Mermaid frame with the fallback renderer. Wrap, copy, and copy-as-Markdown controls support the replacement code-block UI. The Markdown fence helper tests cover copy-as-Markdown output. The Mermaid refactor preserves its existing rendering and controls. No unrelated changes appear in the whole-PR diff.
Full details: Description check
Explanation
The description explains the problem and change and provides detailed verification. However, the Scope and approval section links the issue and says it was triaged through an automated flow, but it does not provide the required explicit maintainer approval of direction and scope or link to the approval comment.
Resolution
Add a link to the triaged issue or discussion and identify the maintainer comment that explicitly approves the direction and scope. If no approval is required, explain why this qualifies as a very small, focused fix of an obvious bug; the current description does not establish that exception.
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apps/mobile/src/native/HighlightedCodeBlock.tsx
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Actionable comments posted: 1
Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix all issues
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Inline comments:
Review comments at @apps/mobile/src/native/EnrichedMarkdownText.tsx:
- Around line 168-198: Update codeBlockElement to exclude Mermaid fences before
calling fallbackHighlightLanguage; ensure mermaid blocks continue to bypass
HighlightedCodeBlock and reach the MermaidCodeBlock renderer with its controls
intact.
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Files selected for processing: 4
apps/mobile/src/native/CodeBlockFrame.tsx
apps/mobile/src/native/EnrichedMarkdownText.tsx
apps/mobile/src/native/HighlightedCodeBlock.tsx
apps/mobile/src/native/MermaidCodeBlock.tsx
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The React fallback for fences enriched-markdown cannot colour dropped the
native block's long-press menu. Long-pressing its code now offers Copy and
Copy as Markdown, and the code text is no longer selectable, as natively.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Handoff from the issue-watch investigation. Reproduced on a physical POCO F4 (c39d2814), Android 14, T3 Code Dev 2.2.0, at main 53bcb9af7a37dd0b4df11a7d6fa0106e9e5b7356: diff, Kotlin, Swift, Dart and SQL fences rendered plain. The native Enriched renderer has 14 default grammars; Swift is opt-in, and the archive lacked diff/Kotlin/Dart/SQL support.
I tested the alternative native-library fix in #33668 at d973d8f2fd845d23925e68589a5aaf8878796496, source 23ce6af473d93ce8fc66fb760d447c36a11ba18e. These results apply to that alternative, not this PR. On the same F4 and message, both themes showed red/green diff lines and colored Kotlin/Swift/Dart/SQL. SQL wrap on/off and diff Copy/Paste preserved behavior and text. Ordinary Markdown selection copied across two displayed lines. Existing Android native code blocks had Copy menus rather than selection handles. A real free Replay turn streamed and completed with highlighted TypeScript; feed movement prevented continuous observation of an open fence. No crash or ANR was observed.
Before/after captures, interaction recordings, build provenance and test output are uploaded in the alternative PR body. Final shared native tests passed 10 cases / 579 assertions, Boat check:changed passed, and required GitHub checks passed at that head. The ARM64 debug APK grew by 9.97 MiB; release size and iOS runtime were not verified. SQL predicate-related coloring remained limited. This size cost is a tradeoff of the native-grammar approach.
Work and pushes on the alternative have stopped. The device was released and test resources cleaned up. No PRs were merged or closed.
Wrapping the fallback code block's horizontal ScrollView in the long-press
menu's Pressable stopped it panning on iOS: React Native disables a
ScrollView's interaction while an ancestor view is the JS responder. The
menu and its Pressable now sit inside the scroller around the code, so
panning works again and a long-press still opens Copy / Copy as Markdown.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The mermaid/math-before-fallback precedence lived only inside
codeBlockElement, so nothing caught the @pierre/highlights 0.5.0
regression where mermaid fences fell through to the code fallback.
Move that decision into codeFenceRenderer in codeBlockMarkdown.ts,
switch on it in codeBlockElement with no behaviour change, and table-test
it. Note that the complete prop is always true in T3 today.
AI-assisted; verified with the tests and tools listed above.
… than the view
With the keyboard open, the in-window Android menu placed itself above or
below its anchor. When neither side had room (a code block taller than the
screen), maxHeight went negative and the menu landed off-screen.
Vertical placement is now the pure deriveMenuVerticalPlacement, beside the
horizontal one. Anchors with room on one side open exactly as before; when
neither side fits two menu rows, the menu overlaps the anchor inside the
keyboard-free area.
AI-assisted; verified with the tests and tools listed above.
Environment for both sides: real Android dev client, Pixel 9, Android 16/API 36, light theme, portrait 1080×2424. Each commit used its own worktree, server, fresh database, and Metro bundle. The private environment header is cropped identically.
Seed the same completed chat response with separate top-level diff, Kotlin, and SQL fences.
Open the sample thread and inspect the blocks. Before each still, require two pixel-identical screenshots with a 500 ms wait between them.
Run the same recorded interaction: toggle Kotlin wrapping on/off, use Copy, then long-press and select Copy as Markdown.
Base renders all three blocks in monochrome. Head colours diff removals/additions and Kotlin/SQL tokens.
AI-assisted; verified with the tests and tools listed above.
Not shown:
Swift, Dart, other languages and aliases, nested or unfinished fences, and math/Mermaid regressions were not exercised; the fixture covers completed top-level diff, Kotlin, and SQL.
Overflowing-line wrapping and exact clipboard contents were not verified; the sample lines fit the viewport, and recordings show control activation and clipboard previews.
iOS, dark theme, tablet, and foldable layouts were not exercised; proof uses an Android phone in light theme.
A matched web comparison was not completed: head web displayed syntax colours, but base web remained on its splash screen during the VM slowdown.
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bugfixFix PR opened by an issue lead; enters the PR looppr:gate-failedA land gate failedsize:L100-499 changed lines (additions + deletions).vouch:trustedPR author is trusted by repo permissions or the VOUCHED list.
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Problem
On mobile, chat code fences in languages that
react-native-enriched-markdowncannot colour render as plain grey text:```diff(added and removed lines uncoloured), andkotlin,sql,swift,ruby,dartand others. Web colours the same message. Chat markdown moved to enriched-markdown in https://git.cafe/pingdotgg/t3code/pulls/16979; its tree-sitter highlighter only compiles 14 default grammars, while the app's own highlighter (@pierre/highlights, already used by the work log and review comments) coloured every fence before.Change
codeBlockElement(apps/mobile/src/native/EnrichedMarkdownText.tsx), the existingrenderers.codeseam that already swaps Mermaid and math fences, now askscodeFenceRenderer(codeBlockMarkdown.ts) which renderer a fence gets: Mermaid, math (when enabled), the app highlighter, or the native block. Mermaid and math are decided first, because the highlighter also knowsmermaid. Natively coloured languages (theCodeBlockLanguages.cppentries with a default grammar), unknown languages and fences without a language keep the native block.HighlightedCodeBlock.tsxdraws the fallback withuseMarkdownCodeHighlight, the code block's own font, size and colours, a language header, the wrap toggle (unwrapped scrolls horizontally) and the copy button. Like the native block, its code is not selectable and a long-press opens Copy / Copy as Markdown; Copy as Markdown fences the code with more backticks than any run inside it.CodeBlockFrame.tsxis the frame and header the Mermaid block already drew, extracted so both share it. Its header now has a minimum height instead of a fixed one, so at large text sizes the label grows instead of being clipped (Mermaid headers included); at the default size it is unchanged.deriveMenuVerticalPlacementbeside the horizontal one; anchors with room open as before, otherwise the menu overlaps the anchor inside the keyboard-free area.Scope and approval
Fixes #33638
Triaged via the automated issue flow.
Verification
codeBlockMarkdown.test.tspins which renderer each fence gets (mermaid before the highlighter, math on/off, upper-case, native,text, empty) and the Markdown-copy fence;menu-placement.test.tspins the off-screen case (anchor taller than the keyboard-free area) and the unchanged open-down/open-up cases. Focused runs pass (codeBlockMarkdown,menu-placement,highlights,highlightLanguage, React Compiler coverage).vp run check:changedpasses; knip shard 2 hit the runner's 900 s timeout once under load, and the fullknip:checkpassed in the commit hook.T3CODE_DEV_SEED=0), same synthetic replies sent through the server RPC and a replayed agent stream. Before = main at merge-base 633438d54f. After: colour stills at 0f0c652771, interaction recordings at 63069af964/c6afa44bc6, large text and streaming at the final head 06c360d934. Commits between them change only Android menu placement, the code scroller's keyboard handling and the header's minimum height; the header change is pixel-identical at default text size (check).Each sheet is Before | After | Diff0 | DiffT, whole screen (clocks and timestamps differ); code-block-only crops of every pair, aligned on each block's header, are in pass 3.
C1 — diff, Kotlin and native TypeScript fences
C2 — Swift, Dart, Ruby, SQL, C++ (Android dark), R1 — Kotlin in a review card, M4 —
mermaidstays a diagram,MERMAIDbecomes coloured code, math off stays nativeAlso captured: E1/E2 empty fences and a >1,000-character line, M2 malformed and empty Mermaid.
Interactions (recordings, steps and timestamps in Evidence-pass2.md)
```now uses a four-backtick fence (before: three, broken)<details>open/closeT1 — largest text (app 22 pt, OS scale 3.2), Android light. An earlier head clipped the header label; the final head shows it whole. Left to right: c6afa44bc6 | 06c360d934 | Diff0 | Diff2%. Main vs final head · wrap and Copy at that size
S1 — 400-line
diffreply, Android, 3 alternating trials per side at 60 Hz, frame stats from reset before send to the settled block (table, before, after): mean janky frames 57.8% on main and 58.8% on this branch, with overlapping ranges; no clear jank-rate increase was resolved, which does not establish equivalence. The largest frame times among the tool's three selected worst windows per trial were 266.8/77.2/135.0 ms on main versus 583.9/1076.9/1183.6 ms on this branch: every trial here was worse on this tail metric around final rendering. These are selected-window maxima on a debug emulator, not verified global worst frames; the cause is unprofiled.What else changed
MERMAIDfences (never diagrams) now render as coloured code instead of plain native code.Not verified
menu-placement.test.ts.Full evidence, seeds and drivers: pass 1 · pass 2 · pass 3 · T1 · S1/U1 · fixture matrix · drivers pass 1 · drivers pass 2 · drivers pass 3 · drivers T1 · drivers S1/U1.
AI-assisted; verified with the tests and tools listed above.