Merge remote-tracking branch 'origin/main' into HEAD

; Conflicts:
;	ROADMAP.md

ROADMAP.md

@@ -253,6 +253,7 @@ Ranked, to beta (detail and remaining milestones in [docs/roadmap.md](docs/roadm
 - 2026-11-03: Layout: a section's closing paragraph whose mark is hidden and that holds only an in-line picture (or a note reference) is no longer laid out as an empty hidden mark. The picture keeps its room, so the next continuous section's text starts below it instead of being drawn over it. A paragraph with only floating objects and a hidden mark still takes no room. Not observed in Word. (#5288)
 - 2026-11-03: Security: DOCX import looks relationships up by id through an index built once per part, the first relationship with an id still winning, instead of scanning every relationship for each hyperlink, picture or embedded part that names one. Readiness unchanged.
 - 2026-11-03: Security: DOCX import no longer carries a file's part named like WordCraft's own bookkeeping (`wordcraft:unmodelled.roots` and the like), which a save read back as that bookkeeping, adding relationships the file chose. Readiness unchanged.
+- 2026-11-03: Security: LaTeX import parses at most 63 cells of a `tabular` row (what a table row keeps), so a very wide row can no longer widen the multirow tracking that every later row walks. Readiness unchanged.
 - 2026-11-03: Language packs: language-packs-2 is published and WordCraft pins its index: 75 languages, adding Danish, German (Germany, Austria, Switzerland), Esperanto, Estonian, Persian, Croatian, Hungarian, Norwegian (Bokmål, Nynorsk), Dutch (#4145, #2505) and Swedish (Sweden, Finland), which need craft-proof's flag-based compounding (storytold/craft-libs#497, pinned). English (Australia) is checked against SCOWL's en-AU list as well as en-GB's (storytold/craft-libs#496). Mongolian and Thai stay hidden. Readiness unchanged.
 - 2026-11-03: Language lists (CP4.3): a language installed from a Language pack (Bulgarian, say) can now be chosen. Set Proofing Language lists every built-in language and every installed or available pack's, each once and sorted by name; Review › Language and the status bar's menu add the installed packs' languages to the short list, with one way of working out the check mark, by tag. A pack's language is stored as a tag that finds the pack again (`sr-Latn-RS` is proofed by the Latin `sr-latn` pack, not the Cyrillic one; Valencian is Word's `ca-ES-valencia`). Every pack in language-packs-2 now has an English name (Belarusian used to show its own name, Беларуская). Readiness unchanged.
 - 2026-11-03: Language packs (CP4.3): on a fresh install (or after an upgrade, with the list cached for an older pin) the missing-pack bar still offers a document language that has no dictionary, "Turkish proofing isn't installed. Install": the person's click turns on downloading, fetches the list and installs the pack if it lists one (if not, the bar goes). With downloading already on, a missing or stale list is fetched once in the background. Choosing a language with only the caret counts before anything is typed, and the spelling context menu's heading (Possible spelling mistake) is in the interface language, not the text's. Closing the bar is remembered per document, per pack and, before the list is known, per language tag. Readiness unchanged.

crates/formats/src/latex/table.rs

@@ -104,7 +104,9 @@ pub(super) fn table(toks: &[Tok], spec: &str, depth: usize) -> FTable {
     for r in rows {
         let mut cells = Vec::new();
         let mut g = 0usize;
-        for cell_toks in r {
+        // A document row keeps MAX_COLS cells; the rest would only widen `covering`, which is
+        // walked once per row.
+        for cell_toks in r.into_iter().take(wordcraft_doc::table::MAX_COLS) {
             let mut cell = Cell::default();
             let mut content = trim_cell(cell_toks);
             // `\multicolumn{n}{spec}{content}`, `\multirow{n}{width}{content}`. Each wrapper

crates/formats/src/latex/tests.rs

@@ -460,3 +460,14 @@ fn ligature_characters_split_across_runs_stay_apart() {
     let back = import(tex.as_bytes());
     assert_eq!(back.plain_text(Default::default()).trim(), "a--b ''x", "{tex}");
 }
+
+#[test]
+fn a_tabular_row_keeps_the_cells_a_table_row_holds() {
+    // A 5,000-cell row with spans widened the multirow tracking every later row walks; the
+    // document keeps MAX_COLS cells a row, so the rest are left out while parsing.
+    let wide = vec!["\\multicolumn{63}{c}{x}"; 5000].join("&");
+    let toks = tokenize(&format!("{wide}\\\\ a & b \\\\"));
+    let t = table::table(&toks, "", 0);
+    assert_eq!(t.rows.first().map(Vec::len), Some(wordcraft_doc::table::MAX_COLS));
+    assert_eq!(t.rows.get(1).map(Vec::len), Some(2));
+}