Prevent copied-code toast stacking

[tannerlinsley]

What changed

Allow the shared toast wrapper to accept Sonner's stable id option, then reuse one ID for code-copy confirmations.

Root cause and impact

CodeBlockView created a new toast for every copy action. Repeated copies therefore accumulated distinct notifications and could cover the documentation viewport, as reported in #960.

With a stable code-copy toast ID, Sonner updates the existing confirmation instead of stacking another one. Other notifications keep their current independent behavior.

Closes #960

Validation

• pnpm test
• TypeScript clean
• oxlint clean
• 143 tests passed; 1 environment-gated docs smoke test skipped
• Commit hook reran formatting and the full test gate successfully
• git diff --check

Risk

Low. The new toast option is optional, and only code-copy confirmations opt into deduplication.

Summary by CodeRabbit

• Bug Fixes
  • Improved code-copy notifications to prevent duplicate toast messages when copying code repeatedly.

[coderabbitai]

📝 Walkthrough

Walkthrough

Toast options now support optional identifiers. ToastProvider passes identifiers to Sonner. Code-copy confirmations use the stable identifier code-copied.

Changes

Toast identifier support

Layer / File(s)	Summary
Toast option and provider forwarding src/components/ToastProvider.tsx	Toast options accept string or numeric identifiers. ToastProvider forwards the identifier to Sonner with the configured duration.
Code-copy notification identifier src/components/markdown/CodeBlockView.tsx	Code-copy confirmation notifications use the identifier code-copied.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The changes assign a stable ID to copied-code toasts, allowing Sonner to replace the existing notification as required by issue #960.
Out of Scope Changes check	✅ Passed	All changes support the linked issue by extending toast ID handling and applying it only to copied-code notifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: preventing repeated copied-code toast notifications from stacking.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch agent/dedupe-code-copy-toast

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	tanstack-com	bcbd6c1	Commit Preview URL Branch Preview URL	Aug 02 2026, 03:12 PM