assert rowCount <= numOfRows;
	private boolean isValidInsertAndPasteArea( List cells )	{		int numOfRows = adapter.getRowCount( );		int rowCount = 0;		for ( int i = 0; i < cells.size( ); i++ )		{			CellContextInfo contextInfo = (CellContextInfo) cells.get( i );			rowCount += contextInfo.getRowSpan( );			// TODO dropping effects		}		assert rowCount <= numOfRows;		if ( rowCount < numOfRows )			return false;		return true;	}