Bug 206279 Removed computed cols listed in expression builder[07]
Description: Removed computed column listed in expression builder inside DataSet Editor dialog Build number:2.2.2.v20071011 Steps to reproduce: 1. New data source and dataset. 2. Add a computed column in dataset and click OK. 3. Open the dataset, remove the computed column. 4. Add a new computed column and check columns in available Data Sets. Expected result: The removed computed column isn't there. Actual result: The removed computed column is still there for selection. Error log:n/a
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/data/ui/util/DataSetProvider.java
{
					}
				}
			}
		}
	}
	/**
	 * To rollback original datasetHandle, clean unused computed columm
	 * 
	 * @param dataSetHandle
	 * @param dsItemModel
	 */
	private void cleanUnusedComputedColumn( DataSetHandle dataSetHandle,
			DataSetViewData[] dsItemModel )
	{
		PropertyHandle handle = dataSetHandle.getPropertyHandle( DataSetHandle.COMPUTED_COLUMNS_PROP );
		if ( handle != null && handle.getListValue( ) != null )
		{
			ArrayList list = handle.getListValue( );
			int count = list.size( );
			for ( int n = count - 1; n >= 0; n-- )
			{
				ComputedColumn rsColumn = (ComputedColumn) list.get( n );
				String columnName = (String) rsColumn.getName( );
				boolean found = false;
				for ( int m = 0; m < dsItemModel.length; m++ )
				{
					if ( columnName.equals( dsItemModel[m].getName( ) ) )
					{
						found = true;