Bug 176436 Charts Imported from Libraries do not update when libraries change
During a live presentation of BIRT at EclipseCon, we came across a rather embarassing issue. When charts are included in a library, and imported into a report design from a library, any changes to the library instance of the chart do not reflect in the report itself.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/SimpleGroupElementHandle.java
* @see org.eclipse.birt.report.model.api.GroupElementHandle#getCommonProperties()
	 */
	public List getCommonProperties( )
	{
		if ( elements.size( ) == 1 )
			return Collections
					.unmodifiableList( ( (DesignElementHandle) elements.get( 0 ) )
							.getElement( ).getPropertyDefns( ) );
		List minProps = getMinPropDefns( );
		List commonProps = new ArrayList( minProps );
		Iterator iter = minProps.iterator( );
		while ( iter.hasNext( ) )
		{
			PropertyDefn propDefn = (PropertyDefn) iter.next( );
			for ( int i = 0; i < elements.size( ); i++ )
			{
				if ( ( (DesignElementHandle) elements.get( i ) ).getElement( )
						.getPropertyDefn( propDefn.getName( ) ) == null )
				{
					commonProps.remove( propDefn );
					break;
				}
			}
		}
		return Collections.unmodifiableList( commonProps );
	}
	/**
	 * Returns the property definition list that has the minimum size.
	 * 
	 * @return the property definition list that has the minimum size.