feat(rich-markdown-editor): round-trip gate, VSCode/style paste, highlight, block reorder by waleedlatif1 · Pull Request #5539 · simstudioai/sim

waleedlatif1 · 2026-07-09T19:05:58Z

Summary

A correctness + capability pass on the rich-markdown (.md) editor. Everything here is empirically verified in a real-browser ProseMirror harness and covered by CI tests.

Correctness — read-only gate (`round-trip-safety.ts`)

Two silent-corruption cases the idempotency probe can't see:

Uppercase HTML entities (&AMP;/&LT;/&GT;) slipped past a case-insensitive safe-list but aren't round-tripped by the serializer → now case-sensitive, opens read-only.
Orphan reference definitions ([x]: url with no [x] use) were dropped entirely on first edit → detected and opened read-only; used definitions still inline losslessly.

Paste (`markdown-paste.ts`)

VSCode code paste — reads the vscode-editor-data payload and pastes a real fenced code block with the source language, instead of flattening the colored-span HTML into plain paragraphs.
<style>/<script> strip — transformPastedHTML removes them so pasting from Google Sheets/Word doesn't leak raw CSS into the doc.

Capabilities

Highlight ==mark== — a <mark> mark serialized to/from ==text== (custom marked tokenizer so nested marks like ==**bold**== survive; comparison operators x == y stay literal). Input rule, paste rule, ⌘⇧H, bubble-menu button, themed styling.
Keyboard block reordering — ⌘⇧↑/⌘⇧↓ moves the current top-level block, carrying the caret.

Validation

Mark stacking matrix — bold/italic/strike/code/highlight combined and nested across paragraphs, headings, lists, blockquotes, links, and (pipe-escaped) table cells — all idempotent, no stacking bugs. Locked in as CI tests.

Deliberately not done

Single-tilde ~x~ — ~x~ and ~~x~~ both render <del>x</del> per the GFM spec (one-or-two tildes = strikethrough), so our single→double normalization is lossless, not a meaning change. Left as-is.
Hover +/grip drag-handle — the keyboard reorder above is the robust core; the hover UI needs a drag-handle dep + visual iteration, best done with live visual QA. Recommended as a focused follow-up.

Testing

Real-browser harness (60+ cases) + committed Vitest in CI: round-trip idempotency, mark stacking, highlight parse/serialize/nesting/safety, block reorder, entity/ref-def gate. No regressions.

vercel · 2026-07-09T19:06:01Z

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cursor · 2026-07-09T19:06:09Z

PR Summary

Medium Risk
Changes affect markdown save safety (editability gate), paste handling, and document mutation on reorder/highlight—well tested but touches user-facing file content paths.

Overview
Expands the workspace rich markdown editor with Obsidian-style ==highlight== (schema mark, bubble menu, ⌘⇧H, markdown round-trip with guards for unrepresentable == in highlighted text) and ⌘⇧↑/↓ block reordering via a new BlockMover extension that keeps the caret on the moved block.

Paste now turns VSCode copies with vscode-editor-data into fenced code blocks (with language aliases; markdown/plaintext still parse as markdown) and strips <style>/<script> from pasted HTML so Sheets/Word CSS does not land in the document; ==…== is recognized in markdown paste hints.

The read-only round-trip gate (isRoundTripSafe) is tightened: uppercase HTML entities (&AMP;, etc.) are no longer treated as safe, and unused link reference definitions force read-only so they are not dropped on first save.

Tests cover block moves, highlight parse/serialize, paste paths, mark stacking idempotency, and the new gate cases.

^{Reviewed by Cursor Bugbot for commit f2b07b1. Configure here.}

greptile-apps · 2026-07-09T19:08:15Z

Greptile Summary

This PR expands the rich markdown editor with safer round-tripping and new editing tools. The main changes are:

Adds ==mark== highlight parsing, serialization, toolbar support, and styling.
Adds VSCode-aware paste handling for code snippets.
Strips pasted style and script HTML before editor parsing.
Adds read-only gating for uppercase entities and orphan reference definitions.
Adds keyboard shortcuts for moving top-level blocks.

Confidence Score: 5/5

This looks safe to merge.

No blocking issues found in the changed code.

Important Files Changed

Filename	Overview
apps/sim/app/workspace/[workspaceId]/files/components/file-viewer/rich-markdown-editor/highlight.ts	Adds the custom highlight mark with markdown parsing, rendering, input and paste rules, keyboard support, and a guard for unrepresentable delimiter text.
apps/sim/app/workspace/[workspaceId]/files/components/file-viewer/rich-markdown-editor/markdown-paste.ts	Adds VSCode clipboard language handling and removes non-content HTML before paste parsing.
apps/sim/app/workspace/[workspaceId]/files/components/file-viewer/rich-markdown-editor/round-trip-safety.ts	Adds safer read-only detection for uppercase HTML entities and unused reference definitions.
apps/sim/app/workspace/[workspaceId]/files/components/file-viewer/rich-markdown-editor/block-mover.ts	Adds keyboard-driven top-level block reordering while preserving the caret position.

_{Reviews (5): Last reviewed commit: "feat(rich-markdown-editor): keyboard blo..." | Re-trigger Greptile}

waleedlatif1 · 2026-07-09T19:49:38Z

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waleedlatif1 · 2026-07-09T19:49:39Z

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waleedlatif1 · 2026-07-09T20:04:00Z

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waleedlatif1 · 2026-07-09T20:14:18Z

@greptile review

waleedlatif1 · 2026-07-09T20:14:19Z

@cursor review

…ies and orphan ref-defs Two silent-corruption cases the idempotency probe can't see: - The HTML-entity safe-list used a case-insensitive regex, so `&AMP;`/`&LT;`/`&GT;` were treated as the round-trippable canonical entities and let through as editable, but the serializer only round-trips the lowercase forms and mangles the uppercase ones. Make the safe-list case-sensitive. - An unused link/image reference definition (`[x]: url` with no `[x]` reference) is dropped entirely on serialize, a deletion the idempotency probe misses. Detect orphan definitions and open read-only; used definitions still inline losslessly and stay editable. The use check tolerates bracket-internal padding (`[ x ]`), and GFM footnote definitions (`[^id]: …`) are excluded since they round-trip verbatim.

…pt> from pasted HTML - Code copied from VSCode carries a `vscode-editor-data` payload with the source language, but its text/html is per-token colored spans that ProseMirror flattens into plain paragraphs. Read the payload and paste a real fenced code block with the mapped language. markdown/plaintext modes resolve to no language and fall through, so markdown copied from VSCode still parses as rich content rather than a fenced block. - Google Sheets and Word prepend a `<style>` block of CSS that PM's DOM parser walks into the document as literal text. Strip <style>/<script> in transformPastedHTML before parsing. - Add a `==…==` inline-mark hint (allowing a lone interior `=`) so a plain-text paste of `==highlight==` routes through the markdown parser and becomes a highlight mark.

Adds a highlight mark rendered as <mark> and serialized to/from ==text== (Pandoc/Obsidian syntax). A custom inline tokenizer parses ==text== (inner text parsed as inline markdown so nested marks like ==**bold**== survive; the body allows a lone `=` so ==a=b== round-trips). `==` cannot be encoded in the delimiter, so an appendTransaction guard strips the mark from any text that ends up containing `==` (e.g. a toolbar highlight over a==b), keeping the text and never emitting the corrupting ==a==b==. Comparison operators (x == y) stay literal. Wired with an input rule, paste rule, Mod-Shift-H, a bubble-menu button, and themed <mark> styling. Also locks in mark-stacking round-trips across contexts.

Mod-Shift-ArrowUp/ArrowDown swaps the current top-level block with its neighbour, carrying the caret at its original offset (newBefore + offset, no off-by-one), and no-ops at the document edges. Exposed as moveBlockUp/moveBlockDown commands (the keyboard shortcuts call them). Pure UI interaction, no schema change. Covered by tests (order, caret offset, edge no-op, list stays intact).

waleedlatif1 · 2026-07-09T20:22:46Z

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waleedlatif1 · 2026-07-09T20:22:47Z

@cursor review

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✅ Bugbot reviewed your changes and found no new issues!

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waleedlatif1 changed the title ~~feat(rich-markdown-editor): parity pass vs inkeep/open-knowledge (round-trip, paste, highlight, block reorder)~~ feat(rich-markdown-editor): round-trip gate, VSCode/style paste, highlight, block reorder Jul 9, 2026

waleedlatif1 force-pushed the feat/md-editor-parity branch from c8c4580 to deff589 Compare July 9, 2026 19:23

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waleedlatif1 mentioned this pull request Jul 9, 2026

v0.7.27: document tags improvements, grok 4.5, forking, custom blocks, library, typescript 7, jupyter notebook, o11y, meta muse, gpt 5.6 #5531

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waleedlatif1 added 2 commits July 9, 2026 13:21

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Summary

Correctness — read-only gate (round-trip-safety.ts)

Paste (markdown-paste.ts)

Capabilities

Validation

Deliberately not done

Testing

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PR Summary

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Greptile Summary

Confidence Score: 5/5

Important Files Changed

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waleedlatif1 commented Jul 9, 2026 •

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Correctness — read-only gate (`round-trip-safety.ts`)

Paste (`markdown-paste.ts`)

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