Bug 122177 Add input for IntervalBase to Group Editor
BIRT model's group definition has one important property: IntervalBase (see GroupHandle.setIntervalBase). This property controls how interval-based grouping picks the range of its initial group, and is an important part of range-based grouping. BIRT designer's Group Details editor should allow user to edit IntervalBase for a group. This is how the editor should work: * IntervalBase options should be presented only if "Interval" is not "None". (Since IntervalBase only makes sense for interval-based grouping) * IntervalBase should be presented in conjunction with checkbox. When it is unchecked (maps to a NULL IntervalBase value), Data Engine dynamically picks a base value using the first group key value in the result set. When it is checked, the user should input a base value. The following is a suggested look of the UI control: [ ] Use fixed base value for interval: _______________ ( [] is a checkbox, underline ___ is a textbox ).
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/GroupDialog.java
{
					inputGroup.setTocExpression( newToc );
				}
			}
			
			int index = keyChooser.getSelectionIndex( );
			String oldKey = inputGroup.getKeyExpr( );
			String newKey = getKeyExpression( );
			inputGroup.setKeyExpr( newKey );
			if ( newKey != null && !newKey.equals( oldKey ) )
			{
				SlotHandle slotHandle = null;
				if ( inputGroup instanceof ListGroupHandle )
				{
					slotHandle = inputGroup.getHeader( );
				}
				else if ( inputGroup instanceof TableGroupHandle )
				{
					if ( inputGroup.getHeader( ).getCount( ) != 0 )
					{
						RowHandle rowHandle = ( (RowHandle) inputGroup.getHeader( )
								.get( 0 ) );
						CellHandle cellHandle = (CellHandle) rowHandle.getCells( )
								.get( 0 );
						slotHandle = cellHandle.getContent( );
					}
				}
				if ( slotHandle != null )
				{
					DesignElementHandle dataItemHandle = InsertInLayoutUtil.performInsert( columnList.get( index ),