fix(web): copy final code block lines as plain text

[jinrehacek]

Fixes #8042.

Triple-clicking the final or only line of a code block can place the selection's trailing boundary outside <pre>. The clipboard handler then serializes the partial block back into fenced Markdown.

Treat the selection as plain code when it starts inside <pre> and contains no non-whitespace text after the block. Selections that continue into prose still use the Markdown serializer.

Tests:

• vp test run --project unit src/markdown-clipboard.test.ts (6 passed)
• targeted formatter and lint checks for the two changed files
• vp run --filter @t3tools/web typecheck
• manually verified in the web client with final-line and single-line triple-click selections

Built with GPT-5.6-Sol using the Codex harness.

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Note

Low Risk
Clipboard-only copy-path tweak for chat markdown; no auth, data, or security changes. Mixed code-plus-prose selections still go through the existing Markdown serializer.

Overview
Fixes copying the last (or only) line of a code block: triple-click can put the range’s trailing boundary outside <pre>, which previously serialized the snippet as fenced Markdown.

chatMarkdownClipboardPayload now uses plainTextForCodeSelection. If the selection is inside pre, or starts there and the trailing fragment has no serialized text (whitespace/newline only), it copies range.toString(). Selections that continue into prose still use Markdown serialization.

^{Reviewed by Cursor Bugbot for commit 88516f9. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Fix copying final code block lines as plain text in web client

Adds plainTextForCodeSelection(range) to markdown-clipboard.ts, which returns range.toString() when a selection is fully within a <pre> or only its trailing boundary exits the block with no following content. Otherwise it returns null so the caller falls back to markdown serialization. Updates chatMarkdownClipboardPayload to use this helper instead of the prior inline closest('pre') check.

• Risk: selections starting in a code block and continuing into prose now correctly serialize as markdown rather than plain text; reviewers should confirm no existing copy flows relied on the old broad plain-text behavior.

^{Macroscope summarized 88516f9.}

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[Copilot]

Pull request overview

Fixes web clipboard handling so final or single-line code selections copy as plain code instead of fenced Markdown.

Changes:

• Detects code selections trailing only whitespace outside <pre>.
• Preserves Markdown serialization when selections extend into prose.
• Adds focused unit tests.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
apps/web/src/markdown-clipboard.ts	Implements plain-text handling for eligible code selections.
apps/web/src/markdown-clipboard.test.ts	Tests contained, final-line, and prose-spanning selections.

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[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

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[macroscopeapp]

Approvability

Verdict: Approved at 88516f9

Macroscope's review found this PR approvable — This is a focused clipboard bug fix that changes only how code-block selections are classified, preserving Markdown serialization for selections that extend into prose. The added unit tests cover the new final-line behavior and the surrounding fallback cases.

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