fix(formats): parse at most MAX_COLS cells of a LaTeX tabular row

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));
+}