fix(xlsx): seat bottom-aligned cell text on the descender line

crates/office2pdf/src/ir/elements.rs

@@ -522,6 +522,11 @@ pub struct Table {
     /// Excel prints cells bottom-aligned by default; Word/PowerPoint keep
     /// the renderer default (top).
     pub default_vertical_align: Option<CellVerticalAlign>,
+    /// When true, a bottom-aligned cell rests its last line's descender on the
+    /// row's bottom inset edge, as Excel prints. Only spreadsheet tables set
+    /// this: Word's and PowerPoint's bottom-cell seating is unverified against
+    /// native GT, so their emission must not change (issue #618).
+    pub seats_bottom_aligned_text_on_descender: bool,
 }
 
 /// A table row.

crates/office2pdf/src/parser/docx_tables.rs

@@ -177,6 +177,8 @@ pub(super) fn convert_table(
         default_cell_padding,
         use_content_driven_row_heights: false,
         default_vertical_align: None,
+        // Word GT has not verified descender seating for bottom cells (#618).
+        seats_bottom_aligned_text_on_descender: false,
     }
 }
 

crates/office2pdf/src/parser/pptx_table_style_tests.rs

@@ -198,6 +198,7 @@ fn test_apply_table_style_first_row_gets_header_fill_and_text_color() {
         default_cell_padding: None,
         use_content_driven_row_heights: true,
         default_vertical_align: None,
+        seats_bottom_aligned_text_on_descender: false,
     };
 
     table_styles::apply_table_style(&mut table, &props, &styles);
@@ -280,6 +281,7 @@ fn test_apply_table_style_banded_rows_skip_first_row() {
         default_cell_padding: None,
         use_content_driven_row_heights: true,
         default_vertical_align: None,
+        seats_bottom_aligned_text_on_descender: false,
     };
 
     table_styles::apply_table_style(&mut table, &props, &styles);
@@ -352,6 +354,7 @@ fn test_apply_table_style_explicit_cell_fill_not_overridden() {
         default_cell_padding: None,
         use_content_driven_row_heights: true,
         default_vertical_align: None,
+        seats_bottom_aligned_text_on_descender: false,
     };
 
     table_styles::apply_table_style(&mut table, &props, &styles);
@@ -395,6 +398,7 @@ fn test_apply_table_style_missing_style_id_is_noop() {
         default_cell_padding: None,
         use_content_driven_row_heights: true,
         default_vertical_align: None,
+        seats_bottom_aligned_text_on_descender: false,
     };
 
     table_styles::apply_table_style(&mut table, &props, &styles);

crates/office2pdf/src/parser/pptx_tables.rs

@@ -404,6 +404,9 @@ impl<'a> PptxTableParser<'a> {
             default_cell_padding: Some(default_pptx_table_cell_padding()),
             use_content_driven_row_heights: true,
             default_vertical_align: None,
+            // PowerPoint GT has not verified descender seating for bottom
+            // cells (#618).
+            seats_bottom_aligned_text_on_descender: false,
         };
         table_styles::apply_table_style(&mut table, &self.table_props, self.table_styles);
         table

crates/office2pdf/src/parser/xlsx.rs

@@ -470,6 +470,7 @@ impl XlsxParser {
                                 default_cell_padding: Some(xlsx_cells::XLSX_CELL_PADDING),
                                 use_content_driven_row_heights: false,
                                 default_vertical_align: Some(crate::ir::CellVerticalAlign::Bottom),
+                                seats_bottom_aligned_text_on_descender: true,
                             },
                             header: sheet_header.clone(),
                             footer: sheet_footer.clone(),
@@ -669,6 +670,7 @@ impl Parser for XlsxParser {
                                 default_cell_padding: Some(xlsx_cells::XLSX_CELL_PADDING),
                                 use_content_driven_row_heights: false,
                                 default_vertical_align: Some(crate::ir::CellVerticalAlign::Bottom),
+                                seats_bottom_aligned_text_on_descender: true,
                             },
                             header: sheet_header.clone(),
                             footer: sheet_footer.clone(),
@@ -744,6 +746,7 @@ impl Parser for XlsxParser {
                                     default_vertical_align: Some(
                                         crate::ir::CellVerticalAlign::Bottom,
                                     ),
+                                    seats_bottom_aligned_text_on_descender: true,
                                 },
                                 header: sheet_header.clone(),
                                 footer: sheet_footer.clone(),

crates/office2pdf/src/parser/xlsx_pagination.rs

@@ -290,6 +290,7 @@ fn slice_table_columns(table: &Table, start: usize, end: usize) -> Table {
         default_cell_padding: table.default_cell_padding,
         use_content_driven_row_heights: table.use_content_driven_row_heights,
         default_vertical_align: table.default_vertical_align,
+        seats_bottom_aligned_text_on_descender: table.seats_bottom_aligned_text_on_descender,
     }
 }
 

crates/office2pdf/src/parser/xlsx_pagination_tests.rs

@@ -65,6 +65,7 @@ fn make_page(column_widths: Vec<f64>, rows: Vec<TableRow>) -> SheetPage {
             default_cell_padding: None,
             use_content_driven_row_heights: false,
             default_vertical_align: None,
+            seats_bottom_aligned_text_on_descender: false,
         },
         header: None,
         footer: None,

crates/office2pdf/src/render/typst_gen.rs

@@ -120,6 +120,17 @@ struct GenCtx {
     /// line box. Decided once per row so every cell in it shares a baseline,
     /// which reading each cell's own text could not guarantee (issue #498).
     row_has_east_asian_text: bool,
+    /// The enclosing table's default vertical alignment: a cell that declares
+    /// none takes this, and its paragraph codegen must know the effective
+    /// answer to seat the line box (issue #618).
+    table_default_vertical_align: Option<CellVerticalAlign>,
+    /// Whether the enclosing table rests bottom-aligned text on the descender
+    /// line, i.e. is a spreadsheet ([`Table::seats_bottom_aligned_text_on_descender`]).
+    table_seats_bottom_aligned_text_on_descender: bool,
+    /// Whether the cell being generated seats its line box on the descender:
+    /// the enclosing table is a spreadsheet and the cell's effective vertical
+    /// alignment is bottom (issue #618).
+    cell_seats_text_on_descender: bool,
     /// Numerals the active section's `PAGE` fields render in. A header is
     /// generated as part of its page's setup, so the section's `w:pgNumType
     /// w:fmt` reaches the field through the context rather than through the
@@ -139,6 +150,9 @@ impl GenCtx {
             table_depth: 0,
             line_grid_pitch: None,
             row_has_east_asian_text: false,
+            table_default_vertical_align: None,
+            table_seats_bottom_aligned_text_on_descender: false,
+            cell_seats_text_on_descender: false,
             page_number_format: PageNumberFormat::default(),
             document_default_text: None,
             document_default_tab_stop_pt: None,
@@ -644,6 +658,8 @@ fn generate_table_with_anchors(
                     default_cell_padding: table.default_cell_padding,
                     use_content_driven_row_heights: table.use_content_driven_row_heights,
                     default_vertical_align: table.default_vertical_align,
+                    seats_bottom_aligned_text_on_descender: table
+                        .seats_bottom_aligned_text_on_descender,
                 };
                 generate_table(out, &segment, ctx)?;
                 out.push('\n');
@@ -680,6 +696,7 @@ fn generate_table_with_anchors(
             default_cell_padding: table.default_cell_padding,
             use_content_driven_row_heights: table.use_content_driven_row_heights,
             default_vertical_align: table.default_vertical_align,
+            seats_bottom_aligned_text_on_descender: table.seats_bottom_aligned_text_on_descender,
         };
         generate_table(out, &segment, ctx)?;
         out.push('\n');