Bug 148761 Unable to copy a report item from template to report
Steps: 1. Create a template, add a Text item "t1" or others 2. Create template item using "t1" 3. Double click the template item and we get a report item again. 4. We copy the item, paste to another report file. Expected: the text item can be copied. Actual result: Nothing happened, not copied and no error msg.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/metadata/SlotDefn.java
* 
	 * @return the list of content elements.
	 */
	public List getContentElements( )
	{
		return new ArrayList( contentElements );
	}
	/**
	 * Returns the set of element types that can appear in the slot. Extended
	 * elements are replaced by actual extensions.
	 * 
	 * @return the list of content elements.
	 */
	public List getContentExtendedElements( )
	{
		MetaDataDictionary dd = MetaDataDictionary.getInstance( );
		IElementDefn extendItem = dd
				.getElement( ReportDesignConstants.EXTENDED_ITEM );
		ArrayList contentsWithExtensions = new ArrayList( );
		contentsWithExtensions.addAll( contentElements );
		if ( contentElements.contains( extendItem ) )
		{
			contentsWithExtensions.remove( extendItem );
			for ( int i = 0; i < dd.getExtensions( ).size( ); i++ )
			{
				ExtensionElementDefn extension = (ExtensionElementDefn) dd
						.getExtensions( ).get( i );
				if ( PeerExtensionLoader.EXTENSION_POINT
						.equals( extension.extensionPoint ) )
					contentsWithExtensions.add( extension );