MarkdownRenderable: bare URLs duplicated as 'url (url)' in concealed mode

[hackerh3]

Bug

When conceal is true (the default for MarkdownRenderable), bare URLs in markdown content render as https://example.com (https://example.com) — the URL text followed by the same URL in parentheses.

This happens because the link case in renderInlineToken unconditionally appends (href) after the link label. For named links like [click here](https://example.com), this renders correctly as click here (https://example.com). But for bare/autolinked URLs, the link text is the href, producing duplication.

Location

packages/core/src/renderables/Markdown.ts — the "link" case in renderInlineToken:

case "link": {
  const linkHref = { url: token.href }
  if (this._conceal) {
    for (const child of token.tokens) {
      this.renderInlineTokenWithStyle(child, chunks, "markup.link.label", linkHref)
    }
    // Always appends (href), even when link text === href
    chunks.push(this.createChunk(" (", "markup.link", linkHref))
    chunks.push(this.createChunk(token.href, "markup.link.url", linkHref))
    chunks.push(this.createChunk(")", "markup.link", linkHref))
  }
}

Fix

Skip the (href) suffix when the link text equals the href:

case "link": {
  const linkHref = { url: token.href }
  if (this._conceal) {
    const linkText = token.tokens.map(t => t.raw).join("")
    const isBareUrl = linkText === token.href
    for (const child of token.tokens) {
      this.renderInlineTokenWithStyle(child, chunks, "markup.link.label", linkHref)
    }
    if (!isBareUrl) {
      chunks.push(this.createChunk(" (", "markup.link", linkHref))
      chunks.push(this.createChunk(token.href, "markup.link.url", linkHref))
      chunks.push(this.createChunk(")", "markup.link", linkHref))
    }
  }
}

Reproduction

Any markdown with a bare URL:

Check https://github.com/anomalyco/opentui for details.

Renders as: Check https://github.com/anomalyco/opentui (https://github.com/anomalyco/opentui) for details.

Expected: Check https://github.com/anomalyco/opentui for details.

This also affects markdown tables where bare URLs are common — the duplication wastes column width and degrades readability.

Affected version

@opentui/core 0.2.6 (and likely since 0.1.88 when conceal was introduced via #767)

Related

• Long URLs in markdown tables are split across lines and become unclickable opencode#18394 — long URLs in tables split/unclickable (separate but related rendering issue)