fix(markdown): preserve URL settings in container titles (#5446)

__tests__/unit/node/markdown/plugins/containers.test.ts

@@ -8,13 +8,18 @@ import type { MarkdownEnv } from 'node/shared'
 async function render(
   src: string,
   options: MarkdownOptions = {},
-  env?: Partial<MarkdownEnv>
+  env?: Partial<MarkdownEnv>,
+  base = '/'
 ) {
   disposeMdItInstance()
-  const md = await createMarkdownRenderer('.', {
+  const md = await createMarkdownRenderer(
+    '.',
+    {
       highlight: (code) => code,
       ...options
-  })
+    },
+    base
+  )
   return md.renderAsync(src, env)
 }
 
@@ -114,6 +119,48 @@ describe('node/markdown/plugins/containers', () => {
     `)
   })
 
+  test.each([
+    ['/', true, true, '/guide/start'],
+    ['./', false, true, '../guide/start.html'],
+    ['./', true, true, '../guide/start'],
+    ['./', false, false, '/guide/start.html']
+  ])(
+    'uses page URL settings in titles (base: %s, cleanUrls: %s, relativizeUrls: %s)',
+    async (base, cleanUrls, relativizeUrls, href) => {
+      const src = [
+        '::: tip [Guide][guide]',
+        '[Guide][guide]',
+        ':::',
+        '',
+        '::: details [Guide][guide]',
+        'content',
+        ':::',
+        '',
+        '[guide]: /guide/start.md'
+      ].join('\n')
+      const html = await render(
+        src,
+        {},
+        { cleanUrls, relativePath: 'nested/page.md', relativizeUrls },
+        base
+      )
+      const link = `<a href="${href}">Guide</a>`
+      expect(html).toContain(`<p class="custom-block-title">${link}</p>`)
+      expect(html).toContain(`<summary>${link}</summary>`)
+      expect(html).toContain(`<p>${link}</p>`)
+    }
+  )
+
+  test('keeps page footnotes out of container titles', async () => {
+    const html = await render(
+      '::: tip [Guide](/guide.md)\nText[^1]\n:::\n\n[^1]: A note'
+    )
+    expect(html).toContain(
+      '<p class="custom-block-title"><a href="/guide.html">Guide</a></p>'
+    )
+    expect(html.match(/class="footnotes"/g)).toHaveLength(1)
+  })
+
   test('respects custom labels from container options', async () => {
     const src = '::: tip\n提示内容\n:::\n\n::: details\n详情内容\n:::'
     expect(

src/node/markdown/plugins/containers.ts

@@ -138,7 +138,13 @@ function createOpenRender(
     if (noTitle) return `<div ${renderedAttrs}>\n`
     const title = md.renderInline(
       info || titlesFor(titles, env.localeIndex)[name],
-      { references: env.references, frontmatter: env.frontmatter }
+      {
+        references: env.references,
+        frontmatter: env.frontmatter,
+        cleanUrls: env.cleanUrls,
+        relativePath: env.relativePath,
+        relativizeUrls: env.relativizeUrls
+      }
     )
     if (name === 'details')
       return `<details ${renderedAttrs}><summary>${title}</summary>\n`