Fix Assert failure for test case bug7714.html

Source/core/rendering/RenderTableSection.cpp

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 388 matching lines @@
     unsigned lastRowIndex = 0;
     unsigned lastRowSpan = 0;
 
     for (unsigned i = 0; i < rowSpanCells.size(); i++) {
         RenderTableCell* cell = rowSpanCells[i];
 
         unsigned rowIndex = cell->rowIndex();
 
         unsigned rowSpan = cell->rowSpan();
 
+        unsigned spanningCellEndIndex = rowIndex + rowSpan;
+        unsigned lastSpanningCellEndIndex = lastRowIndex + lastRowSpan;
+
         // Only heightest spanning cell will distribute it's extra height in row if more then one spanning cells
         // present at same level.
         if (rowIndex == lastRowIndex && rowSpan == lastRowSpan)
             continue;
 
-        int originalBeforePosition = m_rowPos[rowIndex + rowSpan];
+        int originalBeforePosition = m_rowPos[spanningCellEndIndex];
+
+        // When 2 spanning cells are ending at same row index then while extra height distribution of first spanning
+        // cell updates position of the last row so getting the original position of the last row in second spanning
+        // cell need to reduce the height changed by first spanning cell.
+        if (spanningCellEndIndex == lastSpanningCellEndIndex)
+            originalBeforePosition -= extraHeightToPropagate;
 
         if (extraHeightToPropagate) {
-            for (unsigned row = lastRowIndex + lastRowSpan; row <= rowIndex + rowSpan; row++)
+            for (unsigned row = lastSpanningCellEndIndex + 1; row <= spanningCellEndIndex; row++)
                 m_rowPos[row] += extraHeightToPropagate;
         }
 
         lastRowIndex = rowIndex;
         lastRowSpan = rowSpan;
 
         struct SpanningRowsHeight spanningRowsHeight;
 
         populateSpanningRowsHeightFromCell(cell, spanningRowsHeight);
 
         if (!spanningRowsHeight.totalRowsHeight || spanningRowsHeight.spanningCellHeightIgnoringBorderSpacing <= spanningRowsHeight.totalRowsHeight)
             continue;
 
         int totalPercent = 0;
         int totalAutoRowsHeight = 0;
         int totalRemainingRowsHeight = spanningRowsHeight.totalRowsHeight;
 
         // FIXME: Inner spanning cell height should not change if it have fixed height when it's parent spanning cell
         // is distributing it's extra height in rows.
 
         // Calculate total percentage, total auto rows height and total rows height except percent rows.
-        for (unsigned row = rowIndex; row < (rowIndex + rowSpan); row++) {
+        for (unsigned row = rowIndex; row < spanningCellEndIndex; row++) {
             if (m_grid[row].logicalHeight.isPercent()) {
                 totalPercent += m_grid[row].logicalHeight.percent();
                 totalRemainingRowsHeight -= spanningRowsHeight.rowHeight[row - rowIndex];
             } else if (m_grid[row].logicalHeight.isAuto()) {
                 totalAutoRowsHeight += spanningRowsHeight.rowHeight[row - rowIndex];
             }
         }
 
         int extraRowSpanningHeight = spanningRowsHeight.spanningCellHeightIgnoringBorderSpacing - spanningRowsHeight.totalRowsHeight;
 
         distributeExtraRowSpanHeightToPercentRows(cell, totalPercent, extraRowSpanningHeight, spanningRowsHeight.rowHeight);
         distributeExtraRowSpanHeightToAutoRows(cell, totalAutoRowsHeight, extraRowSpanningHeight, spanningRowsHeight.rowHeight);
         distributeExtraRowSpanHeightToRemainingRows(cell, totalRemainingRowsHeight, extraRowSpanningHeight, spanningRowsHeight.rowHeight);
 
         ASSERT(!extraRowSpanningHeight);
 
         // Getting total changed height in the table
-        extraHeightToPropagate = m_rowPos[rowIndex + rowSpan] - originalBeforePosition;
-        m_rowPos[rowIndex + rowSpan] -= extraHeightToPropagate;
+        extraHeightToPropagate = m_rowPos[spanningCellEndIndex] - originalBeforePosition;
     }
 
     if (extraHeightToPropagate) {
         // Apply changed height by rowSpan cells to rows present at the end of the table
-        for (unsigned row = lastRowIndex + lastRowSpan; row <= m_grid.size(); row++)
+        for (unsigned row = lastRowIndex + lastRowSpan + 1; row <= m_grid.size(); row++)
             m_rowPos[row] += extraHeightToPropagate;
     }
 }
 
 // Find out the baseline of the cell
 // If the cell's baseline is more then the row's baseline then the cell's baseline become the row's baseline
 // and if the row's baseline goes out of the row's boundries then adjust row height accordingly.
 void RenderTableSection::updateBaselineForCell(RenderTableCell* cell, unsigned row, LayoutUnit& baselineDescent)
 {
     if (!cell->isBaselineAligned())
@@ skipping 1201 matching lines @@
     if (!style()->isLeftToRightDirection())
         cellLocation.setX(table()->columnPositions()[table()->numEffCols()] - table()->columnPositions()[table()->colToEffCol(cell->col() + cell->colSpan())] + horizontalBorderSpacing);
     else
         cellLocation.setX(table()->columnPositions()[effectiveColumn] + horizontalBorderSpacing);
 
     cell->setLogicalLocation(cellLocation);
     view()->addLayoutDelta(oldCellLocation - cell->location());
 }
 
 } // namespace WebCore