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fix: defer markdown code line number sync during streaming

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Avoids syncing code line numbers while markdown is still streaming
Keeps code block wrapping and line numbers stable after render
Updates code block layout to support deferred gutter insertion
This commit is contained in:
Bohdan Triapitsyn
2026-07-08 20:06:33 +03:00
parent 6d0977fc4e
commit dfed121bf1
2 changed files with 25 additions and 10 deletions
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packages/ui/src/components/chat/markdown/decorate.ts
+15 -4
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@@ -24,6 +24,7 @@ export type DecorateLabels = {
export type DecorateContext = {
labels: DecorateLabels;
codeBlockLineWrap: boolean;
deferCodeLineNumberSync?: boolean;
onToggleCodeBlockLineWrap?: () => void;
// Renders a mermaid block source to svg/ascii using current theme colors.
renderMermaid: (source: string) => MermaidRender;
@@ -97,7 +98,7 @@ const createCodeLineNumbers = (pre: HTMLPreElement): HTMLDivElement => {
const gutter = document.createElement('div');
gutter.setAttribute('data-md-code-line-numbers', '');
gutter.setAttribute('aria-hidden', 'true');
gutter.className = 'select-none border-r border-border/50 pr-3 text-right text-muted-foreground/45';
gutter.className = 'min-w-8 shrink-0 select-none border-r border-border/50 pr-3 text-right font-mono text-[13px] text-muted-foreground/45';
const text = pre.textContent ?? '';
const lineCount = Math.max(1, text.endsWith('\n') ? text.split('\n').length - 1 : text.split('\n').length);
@@ -194,6 +195,12 @@ export const scheduleMarkdownCodeLineNumberSync = (root: HTMLElement): void => {
export const applyMarkdownCodeBlockWrapState = (root: HTMLElement, enabled: boolean, labels: DecorateLabels): void => {
const wrappers = root.querySelectorAll<HTMLElement>('[data-component="markdown-code"]');
for (const wrapper of Array.from(wrappers)) {
const body = wrapper.querySelector<HTMLElement>('[data-md-code-body]');
const pre = wrapper.querySelector<HTMLPreElement>('pre');
if (body && pre && !body.querySelector('[data-md-code-line-numbers]')) {
body.classList.add('flex', 'gap-3');
body.insertBefore(createCodeLineNumbers(pre), pre);
}
applyCodeBlockWrapState(wrapper, enabled, labels);
}
scheduleMarkdownCodeLineNumberSync(root);
@@ -258,18 +265,22 @@ const decorateCodeBlocks = (root: HTMLElement, ctx: DecorateContext): void => {
const body = document.createElement('div');
body.setAttribute('data-md-code-body', '');
body.className = 'flex gap-3 px-3 py-2.5 overflow-x-auto';
body.className = ctx.deferCodeLineNumberSync ? 'px-3 py-2.5 overflow-x-auto' : 'flex gap-3 px-3 py-2.5 overflow-x-auto';
parent.replaceChild(wrapper, pre);
pre.style.margin = '0';
pre.style.background = 'transparent';
pre.classList.add('min-w-0', 'w-full', 'flex-1');
body.appendChild(createCodeLineNumbers(pre));
if (!ctx.deferCodeLineNumberSync) {
body.appendChild(createCodeLineNumbers(pre));
}
body.appendChild(pre);
wrapper.appendChild(header);
wrapper.appendChild(body);
applyCodeBlockWrapState(wrapper, ctx.codeBlockLineWrap, ctx.labels);
scheduleMarkdownCodeLineNumberSync(wrapper);
if (!ctx.deferCodeLineNumberSync) {
scheduleMarkdownCodeLineNumberSync(wrapper);
}
}
};