Ensure table headers trigger rowbreak (#6687)

crates/typst-library/src/layout/grid/resolve.rs

@@ -19,7 +19,7 @@ use typst_library::text::TextElem;
 use typst_library::visualize::{Paint, Stroke};
 
 use typst_syntax::Span;
-use typst_utils::NonZeroExt;
+use typst_utils::{NonZeroExt, SmallBitSet};
 
 use crate::introspection::SplitLocator;
 
@@ -1048,11 +1048,6 @@ impl<'x> CellGridResolver<'_, '_, 'x> {
         // automatically-positioned cell.
         let mut auto_index: usize = 0;
 
-        // The next header after the latest auto-positioned cell. This is used
-        // to avoid checking for collision with headers that were already
-        // skipped.
-        let mut next_header = 0;
-
         // We have to rebuild the grid to account for fixed cell positions.
         //
         // Create at least 'children.len()' positions, since there could be at
@@ -1067,17 +1062,26 @@ impl<'x> CellGridResolver<'_, '_, 'x> {
         let Some(child_count) = children.len().checked_next_multiple_of(columns) else {
             bail!(self.span, "too many cells or lines were given")
         };
+
+        // Rows in this bitset are occupied by an existing header.
+        // This allows for efficiently checking whether a cell would collide
+        // with a header at a certain row. (For footers, it's easy as there is
+        // only one.)
+        //
+        // TODO(subfooters): how to add a footer here while avoiding
+        // unnecessary allocations?
+        let mut header_rows: SmallBitSet = SmallBitSet::new();
         let mut resolved_cells: Vec<Option<Entry>> = Vec::with_capacity(child_count);
         for child in children {
             self.resolve_grid_child(
                 columns,
                 &mut pending_hlines,
                 &mut pending_vlines,
+                &mut header_rows,
                 &mut headers,
                 &mut footer,
                 &mut repeat_footer,
                 &mut auto_index,
-                &mut next_header,
                 &mut resolved_cells,
                 &mut at_least_one_cell,
                 child,
@@ -1129,11 +1133,11 @@ impl<'x> CellGridResolver<'_, '_, 'x> {
         columns: usize,
         pending_hlines: &mut Vec<(Span, Line, bool)>,
         pending_vlines: &mut Vec<(Span, Line)>,
+        header_rows: &mut SmallBitSet,
         headers: &mut Vec<Repeatable<Header>>,
         footer: &mut Option<(usize, Span, Footer)>,
         repeat_footer: &mut bool,
         auto_index: &mut usize,
-        next_header: &mut usize,
         resolved_cells: &mut Vec<Option<Entry<'x>>>,
         at_least_one_cell: &mut bool,
         child: ResolvableGridChild<T, I>,
@@ -1149,18 +1153,35 @@ impl<'x> CellGridResolver<'_, '_, 'x> {
         // in which case this variable remains 'None'.
         let mut row_group_data: Option<RowGroupData> = None;
 
-        // The normal auto index should only be stepped (upon placing an
-        // automatically-positioned cell, to indicate the position of the
-        // next) outside of headers or footers, in which case the auto
-        // index will be updated with the local auto index. Inside headers
-        // and footers, however, cells can only start after the first empty
-        // row (as determined by 'first_available_row' below), meaning that
-        // the next automatically-positioned cell will be in a different
-        // position than it would usually be if it would be in a non-empty
-        // row, so we must step a local index inside headers and footers
-        // instead, and use a separate counter outside them.
+        // Usually, the global auto index is stepped only when a cell with
+        // fully automatic position (no fixed x/y) is placed, advancing one
+        // position. In that usual case, 'local_auto_index == auto_index'
+        // holds, as 'local_auto_index' is what the code below actually
+        // updates.
+        //
+        // However, headers and footers must trigger a rowbreak if the
+        // previous row isn't empty, given they cannot occupy only part of a
+        // row. Therefore, the initial auto index used by their auto cells
+        // should be right below the first empty row.
+        //
+        // The problem is that we don't know whether the header will actually
+        // have an auto cell or not, and we don't want the external auto index
+        // to change (no rowbreak should be triggered) if the header has no
+        // auto cells (although a fully empty header does count as having
+        // auto cells, albeit empty).
+        //
+        // So, we use a separate auto index counter inside the header. It starts
+        // below the first non-empty row. If the header only has fixed-position
+        // cells, the external counter is unchanged. Otherwise (has auto cells
+        // or is empty), the external counter is synchronized and moved to
+        // below the header.
+        //
+        // This ensures lines and cells specified below the header in the
+        // source code also appear below it in the final grid/table.
         let local_auto_index = if matches!(child, ResolvableGridChild::Item(_)) {
-            auto_index
+            // Re-borrow the original auto index so we can reuse this mutable
+            // reference later.
+            &mut *auto_index
         } else {
             // Although 'usize' is Copy, we need to be explicit here that we
             // aren't reborrowing the original auto index but rather making a
@@ -1168,24 +1189,6 @@ impl<'x> CellGridResolver<'_, '_, 'x> {
             &mut (*auto_index).clone()
         };
 
-        // NOTE: usually, if 'next_header' were to be updated inside a row
-        // group (indicating a header was skipped by a cell), that would
-        // indicate a collision between the row group and that header, which
-        // is an error. However, the exception is for the first auto cell of
-        // the row group, which may skip headers while searching for a position
-        // where to begin the row group in the first place.
-        //
-        // Therefore, we cannot safely share the counter in the row group with
-        // the counter used by auto cells outside, as it might update it in a
-        // valid situation, whereas it must not, since its auto cells use a
-        // different auto index counter and will have seen different headers,
-        // so we copy the next header counter while inside a row group.
-        let local_next_header = if matches!(child, ResolvableGridChild::Item(_)) {
-            next_header
-        } else {
-            &mut (*next_header).clone()
-        };
-
         // The first row in which this table group can fit.
         //
         // Within headers and footers, this will correspond to the first
@@ -1253,7 +1256,9 @@ impl<'x> CellGridResolver<'_, '_, 'x> {
             }
         };
 
+        let mut had_auto_cells = false;
         let items = header_footer_items.into_iter().flatten().chain(simple_item);
+
         for item in items {
             let cell = match item {
                 ResolvableGridItem::HLine { y, start, end, stroke, span, position } => {
@@ -1364,16 +1369,17 @@ impl<'x> CellGridResolver<'_, '_, 'x> {
             let resolved_index = {
                 let cell_x = cell.x(self.styles);
                 let cell_y = cell.y(self.styles);
+                had_auto_cells |= cell_x.is_auto() && cell_y.is_auto();
                 resolve_cell_position(
                     cell_x,
                     cell_y,
                     colspan,
                     rowspan,
+                    header_rows,
                     headers,
                     footer.as_ref(),
                     resolved_cells,
                     local_auto_index,
-                    local_next_header,
                     first_available_row,
                     columns,
                     row_group_data.is_some(),
@@ -1511,8 +1517,10 @@ impl<'x> CellGridResolver<'_, '_, 'x> {
 
                 None => {
                     // Empty header/footer: consider the header/footer to be
-                    // at the next empty row after the latest auto index.
+                    // automatically positioned at the next empty row after the
+                    // latest auto index.
                     *local_auto_index = first_available_row * columns;
+                    had_auto_cells = true;
                     let group_start = first_available_row;
                     let group_end = group_start + 1;
 
@@ -1556,6 +1564,13 @@ impl<'x> CellGridResolver<'_, '_, 'x> {
                 }
             }
 
+            if had_auto_cells {
+                // Header/footer was automatically positioned (either by having
+                // auto cells or by virtue of being empty), so trigger a
+                // rowbreak. Move auto index counter right below it.
+                *auto_index = group_range.end * columns;
+            }
+
             match row_group.kind {
                 RowGroupKind::Header => {
                     let data = Header {
@@ -1563,7 +1578,7 @@ impl<'x> CellGridResolver<'_, '_, 'x> {
                         // is gutter. But only once all cells have been analyzed
                         // and the header has fully expanded in the fixup loop
                         // below.
-                        range: group_range,
+                        range: group_range.clone(),
 
                         level: row_group.repeatable_level.get(),
 
@@ -1572,24 +1587,11 @@ impl<'x> CellGridResolver<'_, '_, 'x> {
                         short_lived: false,
                     };
 
-                    // Mark consecutive headers right before this one as short
-                    // lived if they would have a higher or equal level, as
-                    // then they would immediately stop repeating during
-                    // layout.
-                    let mut consecutive_header_start = data.range.start;
-                    for conflicting_header in
-                        headers.iter_mut().rev().take_while(move |h| {
-                            let conflicts = h.range.end == consecutive_header_start
-                                && h.level >= data.level;
-
-                            consecutive_header_start = h.range.start;
-                            conflicts
-                        })
-                    {
-                        conflicting_header.short_lived = true;
-                    }
-
                     headers.push(Repeatable { inner: data, repeated: row_group.repeat });
+
+                    for row in group_range {
+                        header_rows.insert(row);
+                    }
                 }
 
                 RowGroupKind::Footer => {
@@ -1786,9 +1788,13 @@ impl<'x> CellGridResolver<'_, '_, 'x> {
         row_amount: usize,
         at_least_one_cell: bool,
     ) -> SourceResult<Option<Repeatable<Footer>>> {
-        // Mark consecutive headers right before the end of the table, or the
-        // final footer, as short lived, given that there are no normal rows
-        // after them, so repeating them is pointless.
+        headers.sort_unstable_by_key(|h| h.range.start);
+
+        // Mark consecutive headers in those positions as short-lived:
+        // (a) before a header of lower level;
+        // (b) right before the end of the table or the final footer;
+        // That's because they would stop repeating immediately, so don't even
+        // attempt to.
         //
         // It is important to do this BEFORE we update header and footer ranges
         // due to gutter below as 'row_amount' doesn't consider gutter.
@@ -1796,16 +1802,20 @@ impl<'x> CellGridResolver<'_, '_, 'x> {
         // TODO(subfooters): take the last footer if it is at the end and
         // backtrack through consecutive footers until the first one in the
         // sequence is found. If there is no footer at the end, there are no
-        // haeders to turn short-lived.
+        // headers to turn short-lived.
         let mut consecutive_header_start =
             footer.as_ref().map(|(_, _, f)| f.start).unwrap_or(row_amount);
-        for header_at_the_end in headers.iter_mut().rev().take_while(move |h| {
-            let at_the_end = h.range.end == consecutive_header_start;
+        let mut last_consec_level = 0;
+        for header in headers.iter_mut().rev() {
+            if header.range.end == consecutive_header_start
+                && header.level >= last_consec_level
+            {
+                header.short_lived = true;
+            } else {
+                last_consec_level = header.level;
+            }
 
-            consecutive_header_start = h.range.start;
-            at_the_end
-        }) {
-            header_at_the_end.short_lived = true;
+            consecutive_header_start = header.range.start;
         }
 
         // Repeat the gutter below a header (hence why we don't
@@ -2066,32 +2076,37 @@ fn expand_row_group(
 
 /// Check if a cell's fixed row would conflict with a header or footer.
 fn check_for_conflicting_cell_row(
+    header_rows: &SmallBitSet,
     headers: &[Repeatable<Header>],
     footer: Option<&(usize, Span, Footer)>,
     cell_y: usize,
     rowspan: usize,
 ) -> HintedStrResult<()> {
-    // NOTE: y + rowspan >, not >=, header.start, to check if the rowspan
-    // enters the header. For example, consider a rowspan of 1: if
-    // `y + 1 = header.start` holds, that means `y < header.start`, and it
-    // only occupies one row (`y`), so the cell is actually not in
-    // conflict.
-    if headers
-        .iter()
-        .any(|header| cell_y < header.range.end && cell_y + rowspan > header.range.start)
+    if !headers.is_empty()
+        && let Some(row) =
+            (cell_y..cell_y + rowspan).find(|&row| header_rows.contains(row))
     {
         bail!(
-            "cell would conflict with header spanning the same position";
+            "cell would conflict with header also spanning row {row}";
             hint: "try moving the cell or the header"
         );
     }
 
+    // NOTE: y + rowspan >, not >=, footer.start, to check if the rowspan
+    // enters the footer. For example, consider a rowspan of 1: if
+    // `y + 1 = footer.start` holds, that means `y < footer.start`, and it
+    // only occupies one row (`y`), so the cell is actually not in
+    // conflict.
     if let Some((_, _, footer)) = footer
         && cell_y < footer.end
         && cell_y + rowspan > footer.start
     {
+        let row = (cell_y..cell_y + rowspan)
+            .find(|row| (footer.start..footer.end).contains(row))
+            .unwrap();
+
         bail!(
-            "cell would conflict with footer spanning the same position";
+            "cell would conflict with footer also spanning row {row}";
             hint: "try reducing the cell's rowspan or moving the footer"
         );
     }
@@ -2114,11 +2129,11 @@ fn resolve_cell_position(
     cell_y: Smart<usize>,
     colspan: usize,
     rowspan: usize,
+    header_rows: &SmallBitSet,
     headers: &[Repeatable<Header>],
     footer: Option<&(usize, Span, Footer)>,
     resolved_cells: &[Option<Entry>],
     auto_index: &mut usize,
-    next_header: &mut usize,
     first_available_row: usize,
     columns: usize,
     in_row_group: bool,
@@ -2140,12 +2155,11 @@ fn resolve_cell_position(
             // but automatically-positioned cells will avoid conflicts by
             // simply skipping existing cells, headers and footers.
             let resolved_index = find_next_available_position(
-                headers,
+                header_rows,
                 footer,
                 resolved_cells,
                 columns,
                 *auto_index,
-                next_header,
                 false,
             )?;
 
@@ -2182,7 +2196,13 @@ fn resolve_cell_position(
                 // footer (but only if it isn't already in one, otherwise there
                 // will already be a separate check).
                 if !in_row_group {
-                    check_for_conflicting_cell_row(headers, footer, cell_y, rowspan)?;
+                    check_for_conflicting_cell_row(
+                        header_rows,
+                        headers,
+                        footer,
+                        cell_y,
+                        rowspan,
+                    )?;
                 }
 
                 cell_index(cell_x, cell_y)
@@ -2200,26 +2220,11 @@ fn resolve_cell_position(
                 // ('None'), in which case we'd create a new row to place this
                 // cell in.
                 find_next_available_position(
-                    headers,
+                    header_rows,
                     footer,
                     resolved_cells,
                     columns,
                     initial_index,
-                    // Make our own copy of the 'next_header' counter, since it
-                    // should only be updated by auto cells. However, we cannot
-                    // start with the same value as we are searching from the
-                    // start, and not from 'auto_index', so auto cells might
-                    // have skipped some headers already which this cell will
-                    // also need to skip.
-                    //
-                    // We could, in theory, keep a separate 'next_header'
-                    // counter for cells with fixed columns. But then we would
-                    // need one for every column, and much like how there isn't
-                    // an index counter for each column either, the potential
-                    // speed gain seems less relevant for a less used feature.
-                    // Still, it is something to consider for the future if
-                    // this turns out to be a bottleneck in important cases.
-                    &mut 0,
                     true,
                 )
             }
@@ -2230,7 +2235,13 @@ fn resolve_cell_position(
             // footer (but only if it isn't already in one, otherwise there
             // will already be a separate check).
             if !in_row_group {
-                check_for_conflicting_cell_row(headers, footer, cell_y, rowspan)?;
+                check_for_conflicting_cell_row(
+                    header_rows,
+                    headers,
+                    footer,
+                    cell_y,
+                    rowspan,
+                )?;
             }
 
             // Let's find the first column which has that row available.
@@ -2267,12 +2278,11 @@ fn resolve_cell_position(
 /// the column. That is used to find a position for a fixed column cell.
 #[inline]
 fn find_next_available_position(
-    headers: &[Repeatable<Header>],
+    header_rows: &SmallBitSet,
     footer: Option<&(usize, Span, Footer)>,
     resolved_cells: &[Option<Entry<'_>>],
     columns: usize,
     initial_index: usize,
-    next_header: &mut usize,
     skip_rows: bool,
 ) -> HintedStrResult<usize> {
     let mut resolved_index = initial_index;
@@ -2296,33 +2306,30 @@ fn find_next_available_position(
                 // would become impractically large before this overflows.
                 resolved_index += 1;
             }
-        } else if let Some(header) = headers
-            .get(*next_header)
-            .filter(|header| resolved_index >= header.range.start * columns)
-        {
-            // Skip header (can't place a cell inside it from outside it).
-            // No changes needed if we already passed this header (which
-            // also triggers this branch) - in that case, we only update the
-            // counter.
-            if resolved_index < header.range.end * columns {
-                resolved_index = header.range.end * columns;
-
-                if skip_rows {
-                    // Ensure the cell's chosen column is kept after the
-                    // header.
-                    resolved_index += initial_index % columns;
-                }
+        } else if header_rows.contains(resolved_index / columns) {
+            // Skip header rows (can't place a cell inside it from outside it).
+            if skip_rows {
+                // Ensure the cell's chosen column is kept after the header.
+                resolved_index += columns;
+            } else {
+                // Skip to the start of the next row.
+                //
+                // Add 1 to resolved index to force moving to the next row if
+                // this is at the start of one. At the end of one, '+ 1'
+                // already pushes to the next one and 'next_multiple_of' does
+                // not modify it, so nothing bad happens then either.
+                resolved_index = (resolved_index + 1).next_multiple_of(columns);
             }
-
-            // From now on, only check the headers afterwards.
-            *next_header += 1;
-        } else if let Some((footer_end, _, _)) = footer.filter(|(end, _, footer)| {
-            resolved_index >= footer.start * columns && resolved_index < *end * columns
-        }) {
+        } else if let Some((footer_end, _, footer)) = footer
+            && resolved_index >= footer.start * columns
+            && resolved_index < *footer_end * columns
+        {
             // Skip footer, for the same reason.
             resolved_index = *footer_end * columns;
 
             if skip_rows {
+                // Ensure the cell's chosen column is kept after the
+                // footer.
                 resolved_index += initial_index % columns;
             }
         } else {

tests/suite/layout/grid/footers.typ

@@ -105,7 +105,7 @@
   grid.cell(x: 1, y: 3, rowspan: 4)[b],
   grid.cell(y: 2, rowspan: 2)[a],
   grid.footer(),
-  // Error: 3-27 cell would conflict with footer spanning the same position
+  // Error: 3-27 cell would conflict with footer also spanning row 7
   // Hint: 3-27 try reducing the cell's rowspan or moving the footer
   grid.cell(x: 1, y: 7)[d],
 )
@@ -120,7 +120,7 @@
   grid.cell(x: 1, y: 3, rowspan: 4)[b],
   grid.cell(y: 2, rowspan: 2)[a],
   grid.footer(),
-  // Error: 3-33 cell would conflict with footer spanning the same position
+  // Error: 3-33 cell would conflict with footer also spanning row 7
   // Hint: 3-33 try reducing the cell's rowspan or moving the footer
   grid.cell(y: 6, rowspan: 2)[d],
 )
@@ -160,11 +160,20 @@
   columns: 2,
   grid.header(),
   grid.footer(grid.cell(y: 2)[a]),
-  // Error: 3-39 cell would conflict with footer spanning the same position
+  // Error: 3-39 cell would conflict with footer also spanning row 2
   // Hint: 3-39 try reducing the cell's rowspan or moving the footer
   grid.cell(x: 1, y: 1, rowspan: 2)[a],
 )
 
+--- grid-footer-rowbreak-line ---
+#grid(
+  columns: 1,
+  [a],
+  grid.hline(stroke: red),
+  grid.footer([b]),
+  grid.hline(stroke: 3pt),
+)
+
 --- grid-footer-multiple ---
 // Error: 4:3-4:19 cannot have more than one footer
 #grid(
@@ -570,3 +579,11 @@
     table.cell(x: 1)[D],
   ),
 )
+
+--- issue-6666-auto-hlines-around-footer ---
+#table(
+	columns: 2,
+	table.hline(stroke: 2pt + blue),
+	table.footer([*foo*], [*bar*]),
+	table.hline(stroke: 8pt),
+)

tests/suite/layout/grid/headers.typ

@@ -137,6 +137,19 @@
   [a],
 )
 
+--- grid-header-multiple-unordered ---
+#set page(height: 4em)
+#grid(
+  grid.header(grid.cell(x: 0, y: 4)[y]),
+  grid.header([x]),
+  [a],
+  [b],
+  [c],
+  [d],
+  [e],
+  [f],
+)
+
 --- grid-header-skip ---
 #grid(
   columns: 2,
@@ -148,6 +161,63 @@
   [f], grid.cell(x: 1)[g]
 )
 
+--- grid-header-skip-unordered ---
+#grid(
+  columns: 2,
+  [a],
+  grid.header(grid.cell(x: 0, y: 2)[y]),
+  [b],
+  grid.header([x]),
+  [c]
+)
+
+--- grid-header-rowbreak-auto-pos ---
+#grid(
+  columns: 2,
+  [x],
+  grid.hline(stroke: red),
+  grid.header([a]),
+  grid.hline(stroke: 3pt),
+  [y],
+  grid.header(),
+  [z],
+)
+
+--- grid-header-rowbreak-fixed-pos ---
+#grid(
+  columns: 2,
+  [z],
+  grid.hline(stroke: red),
+  grid.header(grid.cell(x: 0)[b]),
+  grid.hline(stroke: 3pt),
+  [w],
+  [j],
+  grid.header(grid.cell(x: 0, y: 9)[c]),
+  [k]
+)
+
+--- grid-header-rowbreak-mixed-pos ---
+#grid(
+  columns: 2,
+  [a],
+  grid.header([x], grid.cell(x: 0)[b]),
+  [c],
+  grid.hline(stroke: red),
+  grid.header([y], grid.cell(x: 0, y: 8)[d]),
+  grid.hline(stroke: 3pt),
+  [e]
+)
+
+--- grid-header-rowbreak-auto-and-fixed-pos ---
+#grid(
+  columns: 2,
+  [a],
+  grid.header([x]),
+  [b],
+  grid.header(grid.cell(x: 0, y: 3)[y]),
+  [c]
+)
+
 --- grid-header-too-large-non-repeating-orphan ---
 #set page(height: 8em)
 #grid(
@@ -398,7 +468,7 @@
     [a], [b],
     [c],
   ),
-  // Error: 3-48 cell would conflict with header spanning the same position
+  // Error: 3-48 cell would conflict with header also spanning row 1
   // Hint: 3-48 try moving the cell or the header
   table.cell(x: 1, y: 1, rowspan: 2, lorem(80))
 )
@@ -411,7 +481,7 @@
     [a], [b],
     [c],
   ),
-  // Error: 3-42 cell would conflict with header spanning the same position
+  // Error: 3-42 cell would conflict with header also spanning row 1
   // Hint: 3-42 try moving the cell or the header
   table.cell(y: 1, rowspan: 2, lorem(80))
 )
@@ -616,6 +686,45 @@
   ),
 )
 
+--- grid-header-collision-multiple-ordered ---
+#grid(
+  columns: 2,
+  grid.cell(x: 0, y: 0)[a],
+  grid.cell(x: 1, y: 0)[a],
+  grid.cell(x: 0, y: 3)[a],
+  grid.header(grid.cell(x: 0, y: 2)[y]),
+  // Error: 15-39 cell would cause header to expand to non-empty row 3
+  // Hint: 15-39 try moving its cells to available rows
+  grid.header(grid.cell(x: 0, y: 3)[y]),
+  grid.header(grid.cell(x: 0, y: 4)[y]),
+)
+
+--- grid-header-collision-multiple-unordered ---
+#grid(
+  columns: 2,
+  grid.cell(x: 0, y: 0)[a],
+  grid.cell(x: 1, y: 0)[a],
+  grid.header(grid.cell(x: 0, y: 2)[y]),
+  grid.header(grid.cell(x: 0, y: 3)[y]),
+  grid.header(grid.cell(x: 0, y: 4)[y]),
+  // Error: 3-27 cell would conflict with header also spanning row 3
+  // Hint: 3-27 try moving the cell or the header
+  grid.cell(x: 0, y: 3)[a]
+)
+
+--- grid-header-collision-multiple-rowspan ---
+#grid(
+  columns: 2,
+  grid.cell(x: 0, y: 0)[a],
+  grid.cell(x: 1, y: 0)[a],
+  grid.header(grid.cell(x: 0, y: 2)[y]),
+  grid.header(grid.cell(x: 0, y: 3)[y]),
+  grid.header(grid.cell(x: 0, y: 4)[y]),
+  // Error: 3-39 cell would conflict with header also spanning row 2
+  // Hint: 3-39 try moving the cell or the header
+  grid.cell(x: 0, y: 1, rowspan: 2)[a]
+)
+
 --- issue-5359-column-override-stays-inside-header ---
 #table(
   columns: 3,
@@ -625,3 +734,15 @@
     table.cell(x: 1)[D],
   ),
 )
+
+--- issue-6666-auto-hlines-around-header ---
+#table(
+	columns: 2,
+	table.hline(stroke: 2pt + blue),
+	table.header([*foo*], [*bar*]),
+	table.hline(stroke: 1.5pt + red),
+	table.cell(colspan: 2)[_asdf_],
+	table.hline(stroke: 1.5pt + red),
+	[a], [b],
+	[c], [d],
+)