[Table] vertical split a cell, and then merge down, the result is wrong

[tengshengbo]

Steps:

1. create a 3rows, 3 columns table
2. vertical split the first cell in the first row
3. select the first cell, merge down.

Expected: the table is still 3 rows, 3 columns
Defect: the table is messy.

[tengshengbo]

This bug is in "tabletools/plugin.js", mergeCells function. After removing an empty tailTr, all cells in the previous row should be updated with new rowSpan.

My fix:

var newmap = null;
			for ( i = count - 1; i >= 0; i-- )
			{
				var tailTr = trs.getItem( i );
				if ( !tailTr.$.cells.length )
				{
					tailTr.remove(); \\
					if (i>0){
						if (!newmap){
							newmap = CKEDITOR.tools.buildTableMap(table );
						}
						
						var cells = cellInRow(newmap, i-1);
						for (var j = 0;j < cells.length;j++){
							if (cells[j].rowSpan>1){								
							cells[j].rowSpan = cells[j].rowSpan-1;
							}
						}
					}
					count++;
					continue;
				}
			}