oficina / docs Public

Google: [Image #1] Oficina: [Image #2] So even though Google is doing paragraphs, prosemirror I think adds an extra paragraph where google only has one. I've seen this before with ProseMirror. Are we satisfied it's the right engine? I think it is, but there could be a better one. But perhaps it's a known tameable solution. See what Fable thinks too

I don't have direct access to this box, you need to serve that HTML on a port and give me the tailscale link

<task-notification> <task-id>a16f4490197abed86</task-id> <tool-use-id>toolu_016fBAMbAHdMY4zQ6bZx4WA3</tool-use-id> <output-file>/home/paulca/.cache/tmp/claude-1001/-home-paulca-amadan-net-oficina-docs/b67dca22-59bf-4290-8b46-545183f24ea9/tasks/a16f4490197abed86.output</output-file> <status>completed</status> <summary>Agent "Fable: is ProseMirror right" finished</summary> <note>A task-notification fires each time this agent stops with no live background children of its own. The user can send it another message and resume it, so the same task-id may notify more than once.</note> <result>## Judgement **Short version: ProseMirror is the right engine, the blank-line bug is a known and tameable ProseMirror clipboard quirk, and the fix is about fifteen lines in the editor bundle that write nothing new onto the wire — so `fragment.rs`, `pdf.go` and `markdown.go` need no change and no new closed-set coupling.** The extra trailing paragraph is almost certainly the same quirk hitting Google's `&lt;b&gt;` wrapper; I show why below but could not confirm it without the real clipboard bytes. I verified all of this by running Google-Docs-shaped HTML through the *shipped* schema (rebuilt from `fixtures/editor-entry.js:44-103` and `fixtures/align.mjs`) and through prosemirror-view 1.42.3's own clipboard path (`__parseFromClipboard`, exported for tests), under Node with linkedom as the DOM. Script and output: `/tmp/claude/pmtest/paste.mjs` (outside the repo; nothing in the worktree was touched). ### 1. Is ProseMirror the right engine? Yes, and the binding constraint decides it more firmly than §6.5 does. The wire format is `Y.XmlFragment("prosemirror")` holding `XmlElement`s named after ProseMirror node types with node attrs as Yjs XML attributes and marks as text-run attributes (`core/src/fragment.rs:17-19`, `143-218`). That shape is what `fragment_html`, `fragment_text` and `fragment_json` walk. Every alternative changes it: - **Lexical** (`@lexical/yjs`) stores a different tree — a root `Y.XmlText` with nested `Y.Map`/`Y.XmlText` per node and Lexical's own property names as attributes. `fragment.rs` is a rewrite, all three renderers with it, and every existing document is orphaned (the module comment at `fragment.rs:17-19` already says what changing the root name alone does). §6.5's three reasons still hold — schema enforcement on remote updates is precisely what lets `fragment.rs` trust node names at all — but the reason that now dominates is not in §6.5: **the Rust reader is a fourth consumer of y-prosemirror's wire format, and it is the only one that cannot run the JS library.** Worth adding a line to §6.5 saying so. Lexical also does not solve paste: its `$generateNodesFromDOM` has its own long-standing Google-Docs `&lt;br&gt;`-to-empty-paragraph issues. It relocates the problem. - **Slate** (`slate-yjs`): different Yjs shape again, no schema enforcement, paste deserialisation is entirely your own code. Worse on every axis that matters here. - **Quill** (`y-quill`): a flat `Y.Text` delta. `fragment.rs` would actually get *simpler*, but you lose nested lists as a tree, tables are a Quill 2 add-on, and there is no decoration mechanism, which §6.1's pagination design depends on. Paste from Google Docs is a known trouble spot in Quill's clipboard matchers too. - **TipTap** is not an alternative; it is ProseMirror with a config layer. Same wire format (its collaboration extension is y-prosemirror; the fragment name is configurable). It would buy you `@tiptap/extension-table`, which is `prosemirror-tables`, and cost you a dependency tree in a bundle that is currently one hand-written entry file. Its paste handling is the code at `prosemirror-view/dist/index.js:2842-2913` — identical to what you have. - **Bespoke model over Yjs**: you would own contenteditable. No. - **ProseMirror + prosemirror-tables** is the only item on the list that addresses a *real* gap (table flattening), and it is not a switch. It adds `table/table_row/table_cell/table_header` elements carrying `colspan`/`rowspan`/`colwidth` — numeric attrs, so `fragment.rs` handles them the way it handles `heading.level` (`fragment.rs:178-186`: parse, clamp, emit a literal), not the way it handles `align`. That is a vocabulary extension across the four files, not a second string-allowlist coupling. Spec §11.2 already commits to tables, images and links in the schema, so this is scheduled work, not a re-decision. Nothing on the list makes paste from Google Docs better. Every editor that accepts HTML has to decide what a bare `&lt;br&gt;` between paragraphs means, and ProseMirror has the cleanest hook for it. ### 2. The mechanism, exactly Google Docs spells an empty paragraph as a **bare `&lt;br /&gt;` sibling between `&lt;p&gt;` elements**, inside its `&lt;b style="font-weight:normal" id="docs-internal-guid-…"&gt;` wrapper. (`prosemirror-schema-basic/dist/index.js:154-157` already special-cases that wrapper for the bold mark, which is how I know the shape.) What happens to that `&lt;br&gt;`: 1. `prosemirror-view/dist/index.js:2892-2896` — the clipboard parser's `ruleFromNode` ignores a `&lt;br&gt;` only if it is the **last child of a non-inline parent** (`inlineParents` at line 2915 lists `b`, `span`, etc.). Google's `&lt;br&gt;` has a next sibling, so it is not ignored. 2. `prosemirror-schema-basic:110` — `hard_break`'s `parseDOM: [{tag: "br"}]` matches. `prosemirror-model:2993-3010` `findPlace` at the open top of a `parseSlice` has no type to fit into, so the `hard_break` lands as a top-level inline sibling of the paragraphs. 3. `prosemirror-view:2924-2969` `normalizeSiblings` then wraps top-level inline nodes in the context's wrapper — a `paragraph` — and `addToSibling` merges *consecutive* `&lt;br&gt;`s into the same one. Result: `paragraph(hard_break)`, or `paragraph(hard_break, hard_break)` for two blank lines. 4. In the editor, `prosemirror-view:1989-2003` `addTextblockHacks` appends `&lt;br class="ProseMirror-trailingBreak"&gt;` whenever a textblock's last child is not a text node. `paragraph(hard_break)` renders as `&lt;p&gt;&lt;br&gt;&lt;br&gt;&lt;/p&gt;`: **two lines**. Experiment output, shipped schema vs. the fix below: ``` A: bare &lt;br /&gt; between paragraphs (Google's empty paragraph) shipped: p("One") p("Two") p("Three") p(hard_break) p("Four") with fix: p("One") p("Two") p("Three") p() p("Four") B: A, plus a trailing &lt;br /&gt; before &lt;/b&gt; shipped: … p("Four") p(hard_break) &lt;-- an extra paragraph at the end with fix: … p("Four") p() C: A, plus &lt;br class="Apple-interchange-newline"&gt; after &lt;/b&gt; shipped: … p("Four") &lt;-- already ignored by ProseMirror's own rule D: blank spelled &lt;p&gt;&lt;br&gt;&lt;/p&gt; shipped: p() (already right) E: blank spelled &lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;/p&gt; shipped: p() (already right — matches your check) F: two bare &lt;br /&gt;&lt;br /&gt; shipped: p("Three") p(hard_break, hard_break) p("Four") with fix: p("Three") p() p() p("Four") ``` **The standard remedy is `transformPasted`** (EditorView prop, `prosemirror-view:2912`; it also covers drag-drop at line 3858). After the clipboard parser has done its work, "a paragraph whose only children are `hard_break`s" is exactly and only the signature of block-level `&lt;br&gt;`s, because `ruleFromNode` has already stripped a trailing `&lt;br&gt;` inside a `&lt;p&gt;`. Map it to that many empty paragraphs: ```js // fixtures/editor-entry.js, in mountView's EditorView props transformPasted: (slice) =&gt; { const out = []; let changed = false slice.content.forEach((node) =&gt; { if (node.type === schema.nodes.paragraph &amp;&amp; node.childCount &gt; 0 &amp;&amp; node.content.content.every((c) =&gt; c.type === schema.nodes.hard_break)) { for (let i = 0; i &lt; node.childCount; i++) out.push(schema.nodes.paragraph.create(node.attrs)) changed = true } else out.push(node) }) return changed ? new Slice(Fragment.from(out), slice.openStart, slice.openEnd) : slice } ``` (Import `Slice`, `Fragment` from `prosemirror-model`; there are no new dependencies.) This is what the `with fix` rows above ran. It is DOM-free, so it can live in its own `fixtures/paste.mjs` with a `node --test` file in the gate exactly like `align.test.mjs`, building slices by hand. One known cost: a CARLOS→CARLOS paste of a paragraph that is *only* Shift+Enters becomes empty paragraphs. Accept and document it; restrict to `!asText` (the third argument) if you want to be tidy. **The trailing paragraph.** Case C is already handled by ProseMirror. Case B — a trailing `&lt;br /&gt;` *inside* Google's `&lt;b&gt;` wrapper — survives because `b` is in `inlineParents`, and yields `paragraph(hard_break)` at the end, two lines tall in the editor. That is my best candidate for what Paul saw; case G (a trailing `&lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;/p&gt;`) is the other. I cannot tell which without the bytes. **Before deciding whether to also drop a trailing blank, capture the real clipboard HTML** — in the editor page's console, `document.addEventListener('paste', e =&gt; console.log(e.clipboardData.getData('text/html')))`, then paste — and check it into `fixtures/data/` as the fixture the test reads. If it is case B, dropping a final hard-break-only paragraph on an HTML paste is consistent with ProseMirror's own rule that a trailing `&lt;br&gt;` is a terminator, not content. ### 3. Where the fix belongs, and coupling Entirely in the editor bundle, and it is the *right* place for a structural reason: the fix emits only `paragraph` elements with no children, which every consumer already knows. `fragment_html` renders `&lt;p&gt;&lt;/p&gt;` (`fragment.rs:172-177`, pinned by `core/tests/fragment.rs:115`), `views/show.html:339-341` gives it a line, `pdf.go:512-517` gives it a line box, `markdown.go:101-107` folds it into the paragraph break. **Nothing new crosses the wire, so this adds no row to the `align.mjs` four-file coupling**, and no vector under `fixtures/vectors/fragment/` needs regenerating. Do not put it in the schema's `parseDOM` (a `br` rule on `paragraph` would need a DOM-sibling test that the `&lt;b&gt;` wrapper defeats, and it would change the schema, which is the wire contract) and do not do it in `transformPastedHTML` (string/DOM surgery, and untestable in the gate, which has no DOM). ### 4. What is wrong or incomplete in the diagnosis - **"`p:empty` does not apply, so the read view shows two lines" — half wrong.** `p:empty` indeed does not match `&lt;p&gt;&lt;br&gt;&lt;/p&gt;`, but a lone `&lt;br&gt;` in a block creates one line box on its own; the no-script read view renders the gap **one** line tall, correctly. The two-line gap is the *editor* (same element, `show.html:771` mounts on `[docs-text docs-editor]`), and the cause is the `ProseMirror-trailingBreak` hack, not the CSS. Only one surface is wrong. - **A separate, pre-existing drift the diagnosis conflates with this one.** For any paragraph ending in a `hard_break` — `p("Three", hard_break)`, i.e. Shift+Enter at the end of a line, no paste involved — the editor shows an extra empty line (Google Docs does the same), while the read view (`&lt;p&gt;Three&lt;br&gt;&lt;/p&gt;`, no trailing line box in HTML) and the PDF (`pdf.go:539-548` flushes the line and the loop ends; the trailing `brk` consumes nothing) show none. The paste fix does not touch this. If you want the three to agree it is one CSS rule (`[docs-text] p:has(&gt; br:last-child) { padding-block-end: 1lh }`) and one branch in `pdf.go`'s paragraph loop; decide first whether the editor or the readers are right. - **Your item 2 understates the link/image problem.** `image` and `link` are in the *browser* schema (schema-basic) so a paste writes them into the CRDT, where `fragment.rs` drops the `href` silently (`link` is not in `MARKS`, `fragment.rs:77-87`) and renders an `image` element as nothing (unknown element, no children, `fragment.rs:203-204`) — the module comment's "silence here is data loss" is exactly what happens. Until `fragment.rs` grows a scheme-allowlisted `href`/`src` (the decision the `MARKS` comment defers), the browser schema should be narrowed to what the reader can show, so a paste cannot write what a reader cannot see. That is a one-line `basic.spec.nodes.remove('image')` and a mark removal, plus a decision recorded in the spec. - Underline, strikethrough, colour, highlight and Docs' font sizes being dropped is correct behaviour under the current MARKS discipline (attribute-free marks only), not a paste bug; each would be a new vocabulary row across the same four files. Say so in the spec rather than letting it read as breakage. ### One line for §6.5 Add: "A fourth consumer of the wire format is the Rust read path (`core/src/fragment.rs`), which cannot run the binding library. Any engine that stores a different Yjs shape re-implements that path and orphans every document; ProseMirror stays for that reason before any other."</result> <usage><subagent_tokens>140510</subagent_tokens><tool_uses>33</tool_uses><duration_ms>498058</duration_ms></usage> </task-notification>

<task-notification> <task-id>by7l46j5s</task-id> <tool-use-id>toolu_01Pu7HzL2cdMY6j91ogLFR9G</tool-use-id> <output-file>/home/paulca/.cache/tmp/claude-1001/-home-paulca-amadan-net-oficina-docs/b67dca22-59bf-4290-8b46-545183f24ea9/tasks/by7l46j5s.output</output-file> <status>failed</status> <summary>Background command "Run the full CI gate" failed with exit code 1</summary> </task-notification>