Fix the rows' height computation with vertical-align: baseline and rowspan

Source/core/rendering/RenderTableSection.cpp

Index: Source/core/rendering/RenderTableSection.cpp
diff --git a/Source/core/rendering/RenderTableSection.cpp b/Source/core/rendering/RenderTableSection.cpp
index dd64e408475da0a47fa7b9d4df4984ceadeacf2d..95be1c543e2c61df2650eb71615421381c936d5e 100644
--- a/Source/core/rendering/RenderTableSection.cpp
+++ b/Source/core/rendering/RenderTableSection.cpp
@@ -324,10 +324,14 @@ int RenderTableSection::calcRowLogicalHeight()
                     if (baselinePosition > cell->borderBefore() + cell->paddingBefore()) {
                         m_grid[cellStartRow].baseline = max(m_grid[cellStartRow].baseline, baselinePosition);
                         // The descent of a cell that spans multiple rows does not affect the height of the first row it spans, so don't let it
-                        // become the baseline descent applied to the rest of the row. 
-                        if (cell->rowSpan() == 1)
+                        // become the baseline descent applied to the rest of the row. Also we don't account for the baseline descent of
+                        // non-spanning cells when computing a spanning cell's extent.
+                        int cellStartRowBaselineDescent = 0;
+                        if (cell->rowSpan() == 1) {
                             baselineDescent = max(baselineDescent, cellLogicalHeight - (baselinePosition - cell->intrinsicPaddingBefore()));
-                        m_rowPos[cellStartRow + 1] = max<int>(m_rowPos[cellStartRow + 1], m_rowPos[cellStartRow] + m_grid[cellStartRow].baseline + baselineDescent);
+                            cellStartRowBaselineDescent = baselineDescent;
+                        }
+                        m_rowPos[cellStartRow + 1] = max<int>(m_rowPos[cellStartRow + 1], m_rowPos[cellStartRow] + m_grid[cellStartRow].baseline + cellStartRowBaselineDescent);
                     }
                 }
             }