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fix(desktop): make un-highlighted code readable while streaming in light theme 

streaming code blocks in the light theme render near-white text on the
white code card until shiki's highlight lands, then snap to normal token
colors. the pale text is @tailwindcss/typography's pre foreground: its
prose theme styles pre as a dark slab (--tw-prose-pre-code = gray-200 on
a gray-800 bg). we strip the bg for our own code card but the near-white
foreground survives on the container. shiki's opaque per-token span
colors normally hide it — it shows through wherever text renders without
spans: the streaming delay window, the lazy-chunk suspense fallback, and
over-budget blocks that never highlight.

traced on the live renderer: computed color on the wrapper of mid-stream
code was oklch(0.928 0.006 264.531) (gray-200), supplied by the
.prose :where(pre) rule.

fix: prose-pre:text-foreground on the markdown container, so every
fenced path inherits the transcript foreground instead. the utility
layer is emitted after typography's base rule in the built css, so the
override wins by order at equal specificity.
This commit is contained in:
ethernet 2026-08-09 19:21:32 -04:00
parent e34c4c009a
commit 3bd844edf1
1 changed files with 6 additions and 0 deletions
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6
apps/desktop/src/components/assistant-ui/markdown-text.tsx
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@ -422,6 +422,12 @@ const MARKDOWN_CONTAINER_CLASS_NAME = cn(
'aui-md prose w-full max-w-none overflow-hidden text-[length:var(--conversation-text-font-size)] leading-(--dt-line-height) text-foreground',
'prose-p:leading-(--dt-line-height) prose-li:leading-(--dt-line-height)',
'prose-headings:text-foreground prose-strong:text-foreground',
// Typography styles `pre` as a dark slab: light text (`--tw-prose-pre-code`,
// gray-200) on a dark bg. We strip its bg for our own light code card but its
// near-white foreground survives — invisible under Shiki's opaque token
// spans, but it's what un-highlighted text inherits (streaming delay,
// Suspense fallback, budget-exceeded blocks): unreadable in light mode.
'prose-pre:text-foreground',
'prose-a:break-words prose-p:[overflow-wrap:anywhere]',
'prose-li:marker:text-muted-foreground/70',
'prose-code:rounded-[0.25rem] prose-code:px-[0.1875rem] prose-code:py-px prose-code:font-mono prose-code:text-[0.9em] prose-code:font-normal prose-code:before:content-none prose-code:after:content-none',