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DottaandPaperclip b1ac92f305 fix(ui): recover blockquotes the markdown editor escaped as backslash-gt (#10466)
## Thinking Path

> - Paperclip is the open source app people use to manage AI agents for
work.
> - The web UI uses one shared markdown editor for comments, issue
descriptions, and documents.
> - Users type `>` at the start of a line to insert a blockquote.
> - The live editor shortcut does not always run in every browser and
input method.
> - The markdown exporter then changes the leading `>` to `\>` and saves
literal text.
> - The saved text does not render as a blockquote.
> - This pull request restores the blockquote marker when markdown
enters or leaves the editor.
> - The benefit is reliable blockquote insertion on every surface that
uses the shared editor.

## Linked Issues or Issue Description

No public GitHub issue exists.

Related prior attempt: #10465.

**What happened?**

The shared markdown editor sometimes saved a blockquote as literal text.
This happened when the live shortcut did not run. The exporter saved `\>
text`, which rendered as literal `> text`.

**Expected behavior**

A line that starts with `>` must render as a blockquote in comments,
issue descriptions, and documents.

**Steps to reproduce**

1. Open a task comment composer, description editor, or document editor.
2. Add `> ` to an existing line, or use an input method that does not
run the live shortcut.
3. Save the content.
4. Observe that the saved line renders as literal text instead of a
blockquote.

**Paperclip version or commit**

`master` at `78f8c6c3d4`.

**Deployment mode**

Self-hosted server.

## What Changed

- Add `unescapeBlockquoteMarkers()` to restore block-level `\>` markers.
- Keep indented code, list content, nested content, and fenced code
unchanged.
- Apply the helper when markdown enters and leaves `MarkdownEditor`.
- Add focused tests for line position, indentation, container prefixes,
and CommonMark fence rules.

## Verification

- `pnpm exec vitest run ui/src/lib/blockquote-markdown.test.ts` passes
with 22 tests.
- `pnpm exec vitest run ui/src/components/MarkdownEditor.test.tsx`
passes with 37 tests.
- `pnpm --filter @paperclipai/ui typecheck` passes.
- `pnpm check:token-gates` passes.
- `git diff --check origin/master...HEAD` passes.
- A browser harness used the real `MarkdownEditor` and `IssueChatThread`
composer. It confirmed that `> text` renders as a blockquote and exports
as `> text`.
- The [Cutter
preview](https://github.com/paperclipai/paperclip/pull/10466#issuecomment-5140558263)
supplies a task-page screenshot and an editor interaction video.

## Risks

- Low risk. The helper returns the input unchanged when it contains no
`\>`.
- A paragraph that deliberately starts with literal `\>` now becomes a
blockquote. The editor has no literal-marker control, so this matches
the available input behavior.
- There are no database, API, or migration changes.

> For core feature work, check [`ROADMAP.md`](ROADMAP.md) first and
discuss it in `#dev` before opening the PR. Feature PRs that overlap
with planned core work may need to be redirected — check the roadmap
first. See `CONTRIBUTING.md`.

## Model Used

- Anthropic Claude Opus 4.8 (`claude-opus-4-8`, 1M context), extended
thinking, with tool use and code execution.
- OpenAI Codex with GPT-5 (`gpt-5`; runtime build and context-window
metadata were not exposed), with reasoning, tool use, code execution,
and GitHub review tools.

## Checklist

- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have checked ROADMAP.md and confirmed this PR does not duplicate
planned core work
- [x] I have searched GitHub for duplicate or related PRs and linked
them above
- [x] I have either (a) linked existing issues with `Fixes: #` / `Closes
#` / `Refs #` OR (b) described the issue in-PR following the relevant
issue template
- [x] I have not referenced internal/instance-local Paperclip issues or
links (only public GitHub `#NNN` / `github.com/paperclipai/paperclip`
URLs)
- [x] My branch name describes the change and contains no internal
Paperclip ticket id or instance-derived details
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [x] I have updated relevant documentation to reflect my changes (none
needed)
- [x] I have considered and documented any risks above
- [x] All Paperclip CI gates are green
- [x] Greptile is 5/5 with no open P2s, recommendations, or follow-ups
- [x] I will address all Greptile and reviewer comments before
requesting merge

---------

Co-authored-by: Paperclip <noreply@paperclip.ing>
2026-07-31 18:52:42 -07:00