Bug 167545 Copy a cascading parameter group and paste it to another parameter group causes an exception thrown
Steps to reproduce: 1.Copy a cascading parameter group using short cut key "Ctrl+x"/"Ctrl+c", or choosing context menu "Cut"/"Copy"; 2.Paste it to another parameter group using short cut key "Ctrl+v", or choosing context menu "Paste"; Expected result: The source one is pasted in the destination. Actual result: An exception thrown org.eclipse.birt.report.model.api.command.ContentException: The Cascading Parameter Group("Source") is not allowed in the slot (parameters) of Parameter Group("Destination").
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DEUtil.java
public static String[] getSystemFontNames( Comparator comparator )
	{
		GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment( );
		String[] fontNames = ge.getAvailableFontFamilyNames( );
		if ( comparator != null )
		{
			Arrays.sort( fontNames, comparator );
		}
		return fontNames;
	}
	/**
	 * Gets the tool used to process multil-selection.
	 * 
	 * @param modelList
	 *            DE model list.
	 * @return The tool used to process multil-selection.
	 */
	public static GroupElementHandle getMultiSelectionHandle( List modelList )
	{
		ModuleHandle designHandle = SessionHandleAdapter.getInstance( )
				.getReportDesignHandle( );
		GroupElementHandle handle = GroupElementFactory.newGroupElement( designHandle,
				modelList );
		return handle;
	}
	/**
	 * Escapes \ and " following standard of Javascript
	 * 
	 * @param str
	 * @return new string after escape special character