Bug 129886 Delect a column contain the marge row which contain some item, Error message pop up
Details: Delect a column contain the marge row which contain some item, Error message pop up Setp: 1.New a library and add a 3*3 grid 2.Insert a label in cell(1,1) 3.Marge the cell of (1,1) and (1,2) 4.Delete column 1. Actual result: An error message pop up
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/schematic/editparts/TableEditPart.java
{
				leftTopPart = part;
			}
			if ( part.getRowNumber( ) <= rightTopPart.getRowNumber( )
					&& part.getColumnNumber( ) + part.getColSpan( ) - 1 >= leftTopPart.getColumnNumber( ) )
			{
				rightTopPart = part;
			}
			if ( part.getColumnNumber( ) <= leftBottomPart.getColumnNumber( )
					&& part.getRowNumber( ) + part.getRowSpan( ) - 1 >= leftBottomPart.getRowNumber( ) )
			{
				leftBottomPart = part;
			}
			if ( part.getRowNumber( ) + part.getRowSpan( ) - 1 >= rightBottomPart.getRowNumber( )
					&& part.getColumnNumber( ) + part.getColSpan( ) - 1 >= rightBottomPart.getColumnNumber( ) )
			{
				rightBottomPart = part;
			}
		}
		return new TableCellEditPart[]{
				leftTopPart, rightTopPart, leftBottomPart, rightBottomPart
		};
	}
	/**
	 * Returns the layer indicated by the key. Searches all layered panes.
	 * 
	 * @see LayerManager#getLayer(Object)
	 */
	public IFigure getLayer( Object key )
	{