ODT: read and write tracked changes (text:tracked-changes) (#1517)

* ODT: read and write tracked changes (gap 19)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

# Conflicts:
#	ROADMAP.md
#	crates/engine/src/tests.rs
#	crates/formats/src/model.rs
#	crates/formats/src/odt.rs
#	docs/file-format-parity.md
#	docs/gaps.md

* ODT tracked changes: deleted paragraph marks don't take the body's insertion; one region per deletion

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Dmitrii Khlapov <19991457+dkhlapov@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

Cargo.lock

@@ -5238,6 +5238,7 @@ name = "wordcraft-formats"
 version = "0.7.0"
 dependencies = [
  "image",
+ "js-sys",
  "log",
  "proptest",
  "quick-xml",

ROADMAP.md

@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~15 points (60% → 75% ready for real work) and ~150–230 h away
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: All Caps text in PDFs, #1473; previously trivial: progress log: Ink to Shape arrows; previously trivial: progress log: privacy options on save, #1062; previously trivial: progress log: equation pictures in theme colours on Windows, #1002; previously trivial: symbol fonts, #776; previously trivial: the save prompt answers from the keyboard, #861; previously trivial: table column and row markers on the rulers, #700; previously trivial: table borders and the resize handle drag on the page, #217; previously trivial: formatting revisions landed, #41; previously trivial: Draw tab ink, #307, and Draw Table and Eraser, #303, landed: catalog 402/434; previously minor: readiness table with hours per audience; full number back to the additive weighted sum, 60%; mainstream and essentials numbers added; alpha gate checked; previously major: full re-measure against Word for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft Word (Microsoft 365) for Mac 16.113.4
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: All Caps text in PDFs, #1473; previously trivial: progress log: ODT tracked changes, gap 19; previously trivial: progress log: RTF tracked changes, gap 19; previously trivial: progress log: symbol fonts, #776; previously trivial: the save prompt answers from the keyboard, #861; previously trivial: table column and row markers on the rulers, #700; previously trivial: table borders and the resize handle drag on the page, #217; previously trivial: formatting revisions landed, #41; previously trivial: Draw tab ink, #307, and Draw Table and Eraser, #303, landed: catalog 402/434; previously minor: readiness table with hours per audience; full number back to the additive weighted sum, 60%; mainstream and essentials numbers added; alpha gate checked; previously major: full re-measure against Word for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft Word (Microsoft 365) for Mac 16.113.4
 
 > **Printing update:** 2026-10-12 · direct desktop printing through craft-print; details below.
 
@@ -156,6 +156,7 @@ Ranked, to beta (detail and remaining milestones in [docs/roadmap.md](docs/roadm
 | 2026-10-14 | Web: Save in the "save changes?" prompt before New or Open now waits for the browser's save picker: the new or opened document replaces yours only once the file is written and closed. Cancelling the picker, or a write that fails, keeps your document open with its edits and undo, still unsaved, and the prompt comes back with the reason; a save that ends after another document has replaced it no longer runs the New/Open on that one or marks it unsaved, and New/Open while a picker save is still in flight ask first (#1315) |
 | 2026-10-13 | Closing with unsaved changes → Save that can't write the file (no permission, locked by another app, folder gone) now says so plainly instead of looking like Cancel: the prompt comes back with the reason in it ("Couldn't save … so it is still open and nothing was lost") for Save again, Don't Save or Cancel, the status bar says it too, and `ui.saveChanges` returns that error; the same for a Save As from the prompt; the document stays open with its edits (#1445) |
 | 2026-10-14 | File › Info › Inspect Document finds hidden text the way Word does (#1344): hidden by direct formatting, a character style or a paragraph style, in the body, headers, footers, footnotes and endnotes, comments and text boxes, and Remove All deletes all of it (and nothing visible) in one undo step, whole hidden paragraphs and the notes of hidden references included. The result lists anything it couldn't reach (`residual`), so a sanitised file is never reported clean by mistake |
+| 2026-10-14 | ODT files keep their tracked changes (gap 19): insertions and deletions made in LibreOffice open as revisions with their author and date, deleted paragraph breaks and text inserted then deleted included, so Accept All and Reject All give the right text; saving to ODT writes them back, and the Track Changes setting goes both ways |
 | 2026-10-14 | RTF keeps tracked changes (gap 19): insertions and deletions open as tracked changes with their authors and dates (`\revtbl`, `\revised`, `\deleted`, `\revdttm`) instead of plain text, so deleted text no longer reappears as normal text; saving to RTF writes them back, and Accept All / Reject All work after reopening |
 | 2026-10-14 | Alignment guides: moving a picture, shape or text box snaps its edges or centre to the page's edges and centre, the margins and the other floating objects on the page, with a thin line across the page for each guide while dragging; Alt moves freely; File › Options › Advanced › Editing turns them off (`ui.alignmentGuides`). Our own design: Word for Mac shows no guides |
 | 2026-10-14 | ODT files open with their sections (#1379): a paragraph that switches to another page style starts a new section on a new page, with that page's size, orientation, margins and columns and, when the file asks, page numbering restarting; a two-column `text:section` becomes a continuous two-column section. Before, the whole document was one portrait section, so landscape pages, columns and restarts were lost on open and on save to DOCX |
@@ -337,6 +338,7 @@ Ranked, to beta (detail and remaining milestones in [docs/roadmap.md](docs/roadm
 | 2026-10-14 | trivial | Progress log: the web's Save before New/Open waits for the save picker (#1315) |
 | 2026-10-13 | trivial | Progress log: a failed save from the close prompt says so (#1445) |
 | 2026-10-14 | trivial | Progress log: Inspect Document removes hidden text in every story (#1344) |
+| 2026-10-14 | trivial | Progress log: ODT tracked changes (gap 19) |
 | 2026-10-14 | trivial | Progress log: RTF tracked insertions and deletions (gap 19) |
 | 2026-10-14 | trivial | Progress log: alignment guides while dragging pictures and shapes |
 | 2026-10-14 | trivial | Progress log: ODT sections on import (#1379) |

crates/engine/src/tests.rs

@@ -5903,3 +5903,89 @@ fn exported_page_images_draw_headers_at_full_strength() {
     assert!(darkest < 60, "header drawn dimmed: darkest pixel {darkest}");
     let _ = std::fs::remove_dir_all(&dir);
 }
+
+/// Gap 19, review: text inserted by one author and deleted by another keeps both marks through
+/// an ODT save, so Reject All (undo the deletion, then the insertion) and Accept All both remove it.
+#[test]
+fn odt_inserted_then_deleted_text_round_trips() {
+    use std::io::Write;
+    let ns = r#"xmlns:office="urn:oasis:names:tc:opendocument:xmlns:office:1.0" xmlns:text="urn:oasis:names:tc:opendocument:xmlns:text:1.0" xmlns:dc="http://purl.org/dc/elements/1.1/""#;
+    let info = |who: &str| format!("<office:change-info><dc:creator>{who}</dc:creator><dc:date>2024-03-01T10:00:00</dc:date></office:change-info>");
+    let content = format!(
+        r#"<office:document-content {ns}><office:body><office:text><text:tracked-changes><text:changed-region text:id="i1"><text:insertion>{}</text:insertion></text:changed-region><text:changed-region text:id="d1"><text:deletion>{}<text:p><text:change-start text:change-id="i1"/>gone<text:change-end text:change-id="i1"/></text:p></text:deletion></text:changed-region></text:tracked-changes><text:p>Keep <text:change text:change-id="d1"/>this.</text:p></office:text></office:body></office:document-content>"#,
+        info("Alice"),
+        info("Bob")
+    );
+    let mut z = zip::ZipWriter::new(std::io::Cursor::new(Vec::new()));
+    let o = zip::write::SimpleFileOptions::default().compression_method(zip::CompressionMethod::Stored);
+    for (name, data) in [("mimetype", "application/vnd.oasis.opendocument.text"), ("content.xml", content.as_str())] {
+        z.start_file(name, o).unwrap();
+        z.write_all(data.as_bytes()).unwrap();
+    }
+    let doc = crate::io::open_bytes("t.odt", &z.finish().unwrap().into_inner()).unwrap();
+    let doc = crate::io::open_bytes("t.odt", &wordcraft_formats::odt::export(&doc).unwrap()).unwrap();
+    for cmd in ["review.rejectAll", "review.acceptAll"] {
+        let mut s = Session::new(doc.clone());
+        run(&mut s, cmd, json!({}));
+        assert_eq!(text(&s), "Keep this.", "{cmd}");
+    }
+}
+
+/// Gap 19: an ODT's tracked insertion and multi-paragraph deletion come in as revisions that
+/// Reject All turns back into the original and Accept All into the edited text.
+#[test]
+fn odt_tracked_changes_accept_and_reject_all() {
+    use std::io::Write;
+    let ns = r#"xmlns:office="urn:oasis:names:tc:opendocument:xmlns:office:1.0" xmlns:text="urn:oasis:names:tc:opendocument:xmlns:text:1.0" xmlns:dc="http://purl.org/dc/elements/1.1/""#;
+    let info = |who: &str| format!("<office:change-info><dc:creator>{who}</dc:creator><dc:date>2024-03-01T10:00:00</dc:date></office:change-info>");
+    let content = format!(
+        r#"<office:document-content {ns}><office:body><office:text><text:tracked-changes><text:changed-region text:id="i1"><text:insertion>{}</text:insertion></text:changed-region><text:changed-region text:id="d1"><text:deletion>{}<text:p>tail</text:p><text:p>head<text:s/></text:p></text:deletion></text:changed-region></text:tracked-changes><text:p>First <text:change text:change-id="d1"/>rest <text:change-start text:change-id="i1"/>added<text:change-end text:change-id="i1"/>.</text:p><text:p>End.</text:p></office:text></office:body></office:document-content>"#,
+        info("Alice"),
+        info("Bob")
+    );
+    let mut z = zip::ZipWriter::new(std::io::Cursor::new(Vec::new()));
+    let o = zip::write::SimpleFileOptions::default().compression_method(zip::CompressionMethod::Stored);
+    for (name, data) in [("mimetype", "application/vnd.oasis.opendocument.text"), ("content.xml", content.as_str())] {
+        z.start_file(name, o).unwrap();
+        z.write_all(data.as_bytes()).unwrap();
+    }
+    let bytes = z.finish().unwrap().into_inner();
+    let doc = crate::io::open_bytes("t.odt", &bytes).unwrap();
+
+    let mut sr = Session::new(doc.clone());
+    run(&mut sr, "review.rejectAll", json!({}));
+    assert_eq!(text(&sr), "First tail\nhead rest .\nEnd.");
+    assert!(sr.doc.revisions.is_empty() || run(&mut sr, "review.changes", json!({})).as_array().unwrap().is_empty());
+
+    let mut sa = Session::new(doc);
+    run(&mut sa, "review.acceptAll", json!({}));
+    assert_eq!(text(&sa), "First rest added.\nEnd.");
+    assert!(run(&mut sa, "review.changes", json!({})).as_array().unwrap().is_empty());
+}
+
+/// Gap 19, review 2: a paragraph break deleted inside an insertion range is not itself
+/// inserted, so Reject All keeps the two paragraphs (after an ODT save, too).
+#[test]
+fn odt_deleted_mark_inside_an_insertion_survives_reject_all() {
+    use std::io::Write;
+    let ns = r#"xmlns:office="urn:oasis:names:tc:opendocument:xmlns:office:1.0" xmlns:text="urn:oasis:names:tc:opendocument:xmlns:text:1.0" xmlns:dc="http://purl.org/dc/elements/1.1/""#;
+    let info = |who: &str| format!("<office:change-info><dc:creator>{who}</dc:creator><dc:date>2024-03-01T10:00:00</dc:date></office:change-info>");
+    let content = format!(
+        r#"<office:document-content {ns}><office:body><office:text><text:tracked-changes><text:changed-region text:id="i1"><text:insertion>{}</text:insertion></text:changed-region><text:changed-region text:id="d1"><text:deletion>{}<text:p/><text:p/></text:deletion></text:changed-region></text:tracked-changes><text:p>One <text:change-start text:change-id="i1"/>A<text:change text:change-id="d1"/>C<text:change-end text:change-id="i1"/> two</text:p></office:text></office:body></office:document-content>"#,
+        info("Alice"),
+        info("Bob")
+    );
+    let mut z = zip::ZipWriter::new(std::io::Cursor::new(Vec::new()));
+    let o = zip::write::SimpleFileOptions::default().compression_method(zip::CompressionMethod::Stored);
+    for (name, data) in [("mimetype", "application/vnd.oasis.opendocument.text"), ("content.xml", content.as_str())] {
+        z.start_file(name, o).unwrap();
+        z.write_all(data.as_bytes()).unwrap();
+    }
+    let doc = crate::io::open_bytes("t.odt", &z.finish().unwrap().into_inner()).unwrap();
+    let saved = crate::io::open_bytes("t.odt", &wordcraft_formats::odt::export(&doc).unwrap()).unwrap();
+    for d in [doc, saved] {
+        let mut s = Session::new(d);
+        run(&mut s, "review.rejectAll", json!({}));
+        assert_eq!(text(&s), "One \n two");
+    }
+}

crates/formats/Cargo.toml

@@ -16,5 +16,9 @@ quick-xml = { workspace = true }
 zip = { workspace = true }
 log = { workspace = true }
 
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+# The browser clock (`SystemTime::now()` panics on wasm32): ODT change dates.
+js-sys = "0.3"
+
 [dev-dependencies]
 proptest = { workspace = true }

crates/formats/src/model.rs

@@ -48,6 +48,10 @@ pub struct Fmt {
 pub struct RevMark {
     pub author: String,
     pub date: String,
+    /// The source's identity of the change, when it has one (an ODT changed region; the
+    /// revision index in [`from_doc_tracked`]): marks with different ids stay separate
+    /// revisions. `None` (RTF) = one revision per kind, author and date.
+    pub id: Option<u32>,
 }
 
 /// An embedded picture.
@@ -125,6 +129,11 @@ pub struct Para {
     pub borders: Option<wordcraft_doc::props::Borders>,
     /// The section this paragraph ends (RTF `\sect`), as the document's last paragraph of it.
     pub section: Option<Box<wordcraft_doc::SectionProps>>,
+    /// Tracked insertion of the paragraph mark.
+    pub mark_ins: Option<Box<RevMark>>,
+    /// Tracked deletion of the paragraph mark (only [`from_doc_tracked`] and formats that keep
+    /// revisions set it).
+    pub mark_del: Option<Box<RevMark>>,
 }
 
 impl Para {
@@ -414,7 +423,7 @@ impl<'a> Builder<'a> {
         let mut revs = std::collections::HashMap::new();
         for (i, r) in doc.revisions.iter().enumerate() {
             if r.move_name.is_none() {
-                let mark = RevMark { author: r.author.clone(), date: r.date.clone() };
+                let mark = RevMark { author: r.author.clone(), date: r.date.clone(), id: None };
                 revs.entry((rev_key(r.kind), mark)).or_insert(i as u32);
             }
         }
@@ -500,6 +509,8 @@ impl<'a> Builder<'a> {
                 }
             }
         }
+        out.mark.ins = p.mark_ins.as_deref().map(|m| self.revision(RevisionKind::Insert, m));
+        out.mark.del = p.mark_del.as_deref().map(|m| self.revision(RevisionKind::Delete, m));
         out.normalize();
         out.touch();
         out
@@ -744,7 +755,7 @@ fn fmt_of(doc: &Document, cp: &CharProps, in_code: bool) -> Fmt {
 /// The insertion and deletion `cp` tracks, as flow marks.
 fn rev_marks(doc: &Document, cp: &CharProps) -> (Option<RevMark>, Option<RevMark>) {
     let mark = |i: Option<u32>| {
-        i.map(|i| doc.revisions.get(i as usize).map(|r| RevMark { author: r.author.clone(), date: r.date.clone() }).unwrap_or_default())
+        i.map(|i| doc.revisions.get(i as usize).map(|r| RevMark { author: r.author.clone(), date: r.date.clone(), id: Some(i) }).unwrap_or_default())
     };
     (mark(cp.ins), mark(cp.del))
 }
@@ -807,6 +818,8 @@ fn flow_paras_in(doc: &Document, p: &Paragraph, tracked: bool) -> Vec<Para> {
         spacing: Spacing::default(),
         borders: None,
         section: None,
+        mark_ins: None,
+        mark_del: None,
     };
     let in_code = kind == Kind::Code;
     let mut k = 0usize;
@@ -833,6 +846,8 @@ fn flow_paras_in(doc: &Document, p: &Paragraph, tracked: bool) -> Vec<Para> {
                         spacing: Spacing::default(),
                         borders: None,
                         section: None,
+                        mark_ins: None,
+                        mark_del: None,
                     };
                     let prev = std::mem::replace(&mut out, next);
                     if prev.inlines.is_empty() {
@@ -898,6 +913,10 @@ fn flow_paras_in(doc: &Document, p: &Paragraph, tracked: bool) -> Vec<Para> {
             out.push_text(&buf, &f);
         }
     }
+    if tracked {
+        let (ins, del) = rev_marks(doc, &p.mark);
+        (out.mark_ins, out.mark_del) = (ins.map(Box::new), del.map(Box::new));
+    }
     done.push(out);
     done
 }

crates/formats/src/rtf.rs

@@ -1066,7 +1066,7 @@ impl Reader {
     /// the table is "Unknown".
     fn rev_mark(&self, i: i32, dttm: u32) -> model::RevMark {
         let author = usize::try_from(i).ok().and_then(|i| self.rev_authors.get(i)).cloned().unwrap_or_else(|| "Unknown".to_string());
-        model::RevMark { author, date: dttm_to_iso(dttm).unwrap_or_default() }
+        model::RevMark { author, date: dttm_to_iso(dttm).unwrap_or_default(), id: None }
     }
 
     fn commit_font(&mut self) {

docs/file-format-parity.md

@@ -1,6 +1,6 @@
 # File-format parity with Microsoft Word
 
-> **Last reviewed:** 2026-10-11 · **Last updated:** 2026-10-14 · **Change:** trivial (All Caps and Small Caps text extracts from PDFs as the capitals shown, #1473; previously trivial: RTF tracked insertions and deletions read and written, gap 19; previously trivial: ODT sections on import, #1379; previously trivial: PDF export: Hebrew and Arabic text extracts as whole words, #1383; previously trivial: HTML header cells bold, cell `text-align` kept, and HTML/Markdown/text open on the region's paper, #1381; previously trivial: `.doc` table cell shading and the extra column, #1380; previously trivial: `.doc` tables from Word 2000+: cell shading, no extra column, merged rows, #1380; previously trivial: VML text boxes keep their internal margins, fit to their text and vertical alignment; hidden drawings not shown; previously trivial: equations as MathML in HTML export, copy and paste, #816; previously trivial: symbol-font text exported as Unicode, #776; previously trivial: text-box margins, Resize shape to fit text and freeforms in groups, #743; previously trivial: formatted paste from the system clipboard's HTML and RTF, #687; previously trivial: independent complex-script formatting inheritance and round-trip regression tests; previously trivial: import/export fixes for TXT, RTF, ODT, HTML and LaTeX, #433–#440; previously major: first version; every format Word reads or writes, measured from the readers and writers on origin/main) · **Target:** Microsoft Word (Microsoft 365) for Mac 16.113.4, plus Word for Windows' extra formats
+> **Last reviewed:** 2026-10-11 · **Last updated:** 2026-10-14 · **Change:** trivial (All Caps and Small Caps text extracts from PDFs as the capitals shown, #1473; previously trivial: ODT tracked changes read and written, gap 19; previously trivial: RTF tracked insertions and deletions read and written, gap 19; previously trivial: symbol-font text exported as Unicode, #776; previously trivial: text-box margins, Resize shape to fit text and freeforms in groups, #743; previously trivial: formatted paste from the system clipboard's HTML and RTF, #687; previously trivial: independent complex-script formatting inheritance and round-trip regression tests; previously trivial: import/export fixes for TXT, RTF, ODT, HTML and LaTeX, #433–#440; previously major: first version; every format Word reads or writes, measured from the readers and writers on origin/main) · **Target:** Microsoft Word (Microsoft 365) for Mac 16.113.4, plus Word for Windows' extra formats
 
 Every format Word opens or saves, what WordCraft does with it, and how it's tested. Fidelity is the
 share of a typical real-world file's content and formatting that survives (read: shows correctly;
@@ -26,7 +26,7 @@ Weights are the share of a Word user's file traffic (estimate). Read/write: ✅
 | `.doc` Word 97-2003 (and `.dot`) | 8% | R/W | 🟡 | ❌ | ~60% | 25–40 | `crates/docbin/src/tests.rs`, `tests/drawing.rs` (56) | Spec-based reader ([MS-DOC]): text, formatting, styles, sections, headers/footers, tables, lists, notes, fields, bookmarks; inline and floating pictures (PNG, JPEG, DIB, TIFF, EMF, WMF; Macintosh PICT as a sized placeholder) with crop, alt text, position and wrap; basic shapes, lines, groups and text boxes ([MS-ODRAW]). Table cell shading from every SHD record (`sprmTDefTableShd`, `sprmTDefTableShdRaw` and their 2nd/3rd ranges, with the Word 97 `Shd80` as fallback; a clear pattern shows its background colour); the row-end mark is not a cell, and each table has its own grid and properties (#1380). Horizontally merged rows stored as fewer, wider cells come with #1123. Freeform shapes, z-order and Word 6/95 or encrypted files are dropped or refused. No writer |
 | PDF open (PDF Reflow, Word for Windows) | 1% | R | ❌ | — | 0% | 30–50 | — | Converting a PDF into an editable document. A sibling app (PdfCraft) may supply the parser |
 | `.rtf` Rich Text Format | 3% | R/W | 🟡 | 🟡 | ~50% | 10–15 | `crates/formats/src/tests.rs` | ~1,500 lines: text, character/paragraph formatting, styles, lists, tables, pictures (`\shppict`, #154), fields, bookmarks. 8-bit text in the document's code page (`\ansicpg`) or the current font's (`\fcharset`, `\cpg`): Cyrillic, Central European, Greek, Turkish, Hebrew, Arabic, Baltic, Vietnamese, Thai (was Windows-1252 only). Pasted from the system clipboard where the platform offers it (Windows, Wayland) when there is no HTML (#687). Tracked insertions and deletions read and written (`\revtbl`, `\revised`/`\deleted`, authors, `\revdttm` dates), so Accept/Reject All work after opening or a round trip; paragraph-mark and formatting revisions not yet. Sections on import (#1378): each `\sect` ends a section with its own page size and orientation, margins, header/footer distance, columns, break type, page-number restart, start and format, title page and headers/footers (those it leaves out link to the previous); export still writes one section. Thin: comments, notes, section export, RTL |
-| `.odt` OpenDocument Text | 2% | R/W | 🟡 | 🟡 | ~50% | 8–12 | `crates/formats/src/tests.rs`, `crates/formats/src/odt.rs` unit tests, `crates/engine/tests/odt_sections.rs` | Styles, lists (#87), tables, pictures, headers/footers, page breaks (#86), page size, orientation and margins (#810), sections: one per master-page change on a paragraph or table (next page, with its own page size, orientation, margins, columns and page-numbering restart) and per columned `text:section` (continuous, with its columns and separator line) (#1379). No footnotes, comments, tracked changes, fields or RTL |
+| `.odt` OpenDocument Text | 2% | R/W | 🟡 | 🟡 | ~50% | 8–12 | `crates/formats/src/tests.rs`, `crates/formats/src/odt.rs` unit tests, `crates/engine/tests/odt_sections.rs` | Styles, lists (#87), tables, pictures, headers/footers, page breaks (#86), page size, orientation and margins (#810), sections: one per master-page change on a paragraph or table (next page, with its own page size, orientation, margins, columns and page-numbering restart) and per columned `text:section` (continuous, with its columns and separator line) (#1379); tracked insertions and deletions with author and date, inserted and deleted paragraph marks and text inserted then deleted included (ODF change tracking; format changes read as none; pictures and tables inside a tracked deletion are dropped). No footnotes, comments, fields or RTL |
 | `.txt` Plain text | 2% | R/W | ✅ | ✅ | ~95% | 1–2 | unit tests | Encoding detection. Files with other extensions (`.m3u`/`.m3u8` playlists, logs, config files, no extension) open as text when they are text, Word and RTF files by their signature; binary files are refused (#569). A Word or RTF extension that contradicts the content also opens by signature, as in Word: RTF saved as `.doc` (hh.ru résumés, accounting exports), a `.docx` renamed `.doc`, a Word 97-2003 file renamed `.docx`. Word's encoding choice dialog and line-ending options missing; such files save only through Save As |
 | `.htm/.html` Web Page and Web Page, Filtered | 1% | R/W | 🟡 | 🟡 | ~60% | 6–10 | `crates/formats/src/tests.rs` | Tables (#102), relative pictures embedded (#113), missing `</head>` tolerated (#154). Header cells (`<th>`) bold unless their CSS says otherwise; `text-align` on a cell, or inherited from its row, row group or table, aligns the cell's paragraphs (#1381). HTML gives no page size, so it opens on the region's paper (A4 or Letter), as Markdown and plain text do; `@page` isn't read (#1381). No Word "Web Page" (with `_files` folder) round-trip. The same reader takes HTML from the system clipboard: Paste keeps another program's formatting (a Word document, a web page; Windows' "HTML Format" header understood), Merge Formatting keeps its emphasis (#687). Equations are written as MathML (with the linear format as a UnicodeMath annotation) and read back from MathML: our annotation, else the presentation elements, else a TeX annotation (#816) |
 | `.mht/.mhtml` Single File Web Page | <1% | R/W | ❌ | ❌ | 0% | 3–5 | — | |
@@ -170,6 +170,7 @@ raise readiness estimates. No Word-derived files are fixtures.
 | 2026-10-12 | trivial | Direct run-level `w:contentPart` InkML keeps its relationship, content type and bytes through DOCX edits and repeated saves; nested group/canvas ink and native rendering remain missing |
 | 2026-10-13 | trivial | HTML export writes equations as MathML instead of linear text, and HTML import (open and paste) reads `<math>` back into equations; a copy holding an equation puts that HTML on the system clipboard: MathML in HTML on the clipboard (Word/LibreOffice paste not yet verified; OMML is #1297) (#816) |
 | 2026-10-14 | trivial | PDF export: All Caps and Small Caps text extracts in capitals, as displayed, and no longer turns later capitals in uncapitalised text lowercase (#1473) |
+| 2026-10-14 | trivial | ODT tracked changes: `text:tracked-changes` insertions and deletions open as revisions (author, date, inserted and deleted paragraph marks, insertions nested in deletions) and are written back, a missing date as the save time; `text:track-changes` maps to Track Changes on/off. Pictures, other objects and tables inside a tracked deletion are dropped |
 | 2026-10-14 | trivial | RTF reads and writes tracked insertions and deletions with their authors and dates (gap 19); deleted text no longer opens as normal text |
 | 2026-10-14 | trivial | ODT import reads sections: a paragraph naming another master page starts a new-page section with that page's size, orientation, margins and columns, and its `style:page-number` restart; a columned `text:section` is a continuous section with its columns (#1379) |
 | 2026-10-14 | trivial | PDF export writes right-to-left runs' glyphs in visual order, so Chrome, Edge (PDFium) and poppler extract Hebrew and Arabic as whole words (vowelled words keep their letters in order but may extract with spaces inside), and Ctrl+F finds them (#1383). `/ReversedChars` (for strict file-order readers) covers plain runs and vowelled runs whose marks split into their own glyphs, not runs with ligatures or mixed directions |

docs/gaps.md

@@ -1,6 +1,6 @@
 # Where WordCraft falls short of Word
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (RTF tracked insertions and deletions, gap 19; previously trivial: Ink to Shape recognises arrows; previously trivial: sample-text formulas on Enter, #1067; previously trivial: #29: copied equations as MathML, OMML open as #1297, #816; previously trivial: the Font list no longer keeps every previewed font in memory, #848; previously trivial: table column and row markers on the rulers, #700; previously trivial: table borders and the resize handle drag on the page, #217; previously trivial: formatting revisions landed, #41; previously trivial: Draw Table and Eraser landed, #303; previously minor: beta distance restated: ~15 points, ~150–230 h; previously: first version; every known shortfall from the 2026-10-10 re-measure, ranked) · **Target:** Microsoft Word (Microsoft 365) for Mac 16.113.4
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-14 · **Change:** trivial (ODT tracked insertions and deletions, gap 19; previously trivial: RTF tracked insertions and deletions, gap 19; previously trivial: the Font list no longer keeps every previewed font in memory, #848; previously trivial: table column and row markers on the rulers, #700; previously trivial: table borders and the resize handle drag on the page, #217; previously trivial: formatting revisions landed, #41; previously trivial: Draw Table and Eraser landed, #303; previously minor: beta distance restated: ~15 points, ~150–230 h; previously: first version; every known shortfall from the 2026-10-10 re-measure, ranked) · **Target:** Microsoft Word (Microsoft 365) for Mac 16.113.4
 
 > **Printing update:** 2026-10-12 · direct desktop printing through craft-print; details below.
 
@@ -33,7 +33,7 @@ Native save reliability: synthetic cases on macOS reproduced loss through the pr
 | 16 | **Right-to-left completeness**: kashida, RTL in HTML/ODT/RTF; eight older RTL bug reports to re-verify after #207 (#215, #211, #199, #66, #63, #48, #19). RTL tables and sections landed (#362); PDF export's Hebrew and Arabic text copies and searches as whole words (#1383) | | [layout-parity.md](layout-parity.md) | Arabic, Persian, Hebrew writers | 7–11 | [layout-parity.md](layout-parity.md) |
 | 17 | **East Asian typography**: Asian Typography options (Phonetic Guide landed, #288; Enclose Characters landed, #297; document grid landed, #391; vertical text landed, #491) | | Catalog misses `para.asianTypography` | Chinese, Japanese and Korean documents | 11–19 | [layout-parity.md](layout-parity.md) |
 | 18 | **Screen-reader access** to the document canvas: exposed, not yet tried with real screen readers | | The canvas describes paragraphs, headings, lists, tables, links, pictures and the caret to AccessKit (#488), tested headlessly; no NVDA, VoiceOver or Orca run yet | Blind and low-vision users; public-sector procurement | 3–6 | [ui-parity.md](ui-parity.md) |
-| 19 | **RTF and ODT depth**: notes, comments, revisions (RTF insertions and deletions done), sections (RTF import done, #1378; RTF export and ODT left), RTL. ODT sections landed on import (#1379): page-style changes and columned `text:section`s | | ~1,500 lines each in `crates/formats` | Users exchanging with LibreOffice or older tools | 18–27 | [file-format-parity.md](file-format-parity.md) |
+| 19 | **RTF and ODT depth**: notes, comments, revisions (RTF and ODT insertions and deletions done), sections (RTF import done, #1378; RTF export and ODT left), RTL. ODT sections landed on import (#1379): page-style changes and columned `text:section`s | | ~1,500 lines each in `crates/formats` | Users exchanging with LibreOffice or older tools | 18–27 | [file-format-parity.md](file-format-parity.md) |
 | 20 | **Performance on large real-world documents** unmeasured (500+ pages, many pictures) | | Only the 188-page sample benchmark; scrolling a 1,096-page one-table document went from ~600 ms to ~2–5 ms a frame (#811), but opening it still lays out for seconds | Thesis and book authors | 10–20 | [layout-parity.md](layout-parity.md) |
 | 21 | **Mail merge data sources**: no Outlook/Contacts, Access or database sources, no email merge; CSV, typed lists (#247) and Excel/OpenDocument spreadsheets (#334) only | | Select Recipients reads .csv/.tsv, .xlsx/.xlsm and .ods | Office administrators | 4–8 | [target-app-parity.md](target-app-parity.md) |
 | 22 | **Ecosystem**: no VBA execution (macros preserved only), no Office add-ins, no cloud storage, no real-time co-authoring | | `.docm` keeps macros (#172) | Enterprise users with macro templates; teams | 40–80 + owner decisions | [target-app-parity.md](target-app-parity.md) |
@@ -84,6 +84,7 @@ The same gaps grouped the way the parity documents are, for agents working in on
 | 2026-10-12 | trivial | Sample-text formulas on Enter (#1067) implemented; numerical limits not compared in Word |
 | 2026-10-12 | minor | Italian proofing landed (it-IT spelling from the installed Hunspell dictionary, accent-first suggestions, conservative grammar); gap #8 narrowed to the remaining languages |
 | 2026-10-12 | trivial | #2 narrowed: direct run-level `w:contentPart` InkML survives DOCX edits and repeated saves; nested group/canvas ink and native rendering remain |
+| 2026-10-14 | trivial | Gap 19: ODT tracked insertions and deletions (with paragraph marks, and text inserted then deleted) read and written |
 | 2026-10-14 | trivial | Gap 19: RTF tracked insertions and deletions read and written; RTF paragraph-mark and formatting revisions, and ODT revisions, remain |
 | 2026-10-14 | trivial | #19 narrowed: ODT import keeps sections (master-page changes, columned `text:section`s, page-numbering restarts) (#1379) |
 | 2026-10-14 | trivial | #16: PDF export writes right-to-left glyphs in visual order, so Hebrew and Arabic extract, copy and search as whole words (#1383) |