Bug 204245 Blank column on visibility column in excel[0300]
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/html/HTMLTableLayoutEmitter.java
Cell.Content cellContent )
	{
		layout.createCell( colId, rowSpan, colSpan, cellContent );
		if ( rowSpan < 0 )
		{
			hasDropCell = true;
		}
	}
	protected int createDropID( int groupIndex, String dropType )
	{
		int dropId = -10 * ( groupIndex + 1 );
		if ( "all".equals( dropType ) ) 
		{
			dropId--;
		}
		return dropId;
	}
	public void resolveAll(boolean finished )
	{
		if ( hasDropCell )
		{
			layout.resolveDropCells( finished );
			hasDropCell = layout.hasDropCell( );
		}
	}
	public void resolveCellsOfDrop( int groupLevel, boolean dropAll, boolean finished )
	{
		if ( hasDropCell )
		{
			if ( dropAll )