From 9b3229da174d9a4159a9530c65ee4d6aa2c13014 Mon Sep 17 00:00:00 2001
From: Simon Wanner <skyrising@pvpctutorials.de>
Date: Mon, 28 Mar 2022 14:39:37 +0200
Subject: [PATCH] LibWeb: Distribute the width of a table cell spanning
 multiple columns

---
 .../LibWeb/Layout/TableFormattingContext.cpp  | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/Userland/Libraries/LibWeb/Layout/TableFormattingContext.cpp b/Userland/Libraries/LibWeb/Layout/TableFormattingContext.cpp
index 036b89221a..a2c15ce779 100644
--- a/Userland/Libraries/LibWeb/Layout/TableFormattingContext.cpp
+++ b/Userland/Libraries/LibWeb/Layout/TableFormattingContext.cpp
@@ -91,9 +91,26 @@ void TableFormattingContext::calculate_column_widths(Box const& row, Vector<floa
         } else {
             (void)layout_inside(cell, LayoutMode::Normal);
         }
-        column_widths[column_index] = max(column_widths[column_index], cell_state.border_box_width());
+        if (cell.colspan() == 1)
+            column_widths[column_index] = max(column_widths[column_index], cell_state.border_box_width());
         column_index += cell.colspan();
     });
+    column_index = 0;
+    row.for_each_child_of_type<TableCellBox>([&](auto& cell) {
+        auto& cell_state = m_state.get_mutable(cell);
+        size_t colspan = cell.colspan();
+        if (colspan != 1) {
+            float missing = cell_state.border_box_width();
+            for (size_t i = 0; i < colspan; ++i)
+                missing -= column_widths[column_index + i];
+            if (missing > 0) {
+                float extra = missing / (float)colspan;
+                for (size_t i = 0; i < colspan; ++i)
+                    column_widths[column_index + i] += extra;
+            }
+        }
+        column_index += colspan;
+    });
 }
 
 void TableFormattingContext::layout_row(Box const& row, Vector<float>& column_widths)