Bug 191168 [Regression]Exception occurs when resize masterpage in library
Description: Exception occurs when resize masterpage in library. Build number:2.2.0.v20070606-0630 Regression bug:187443 Steps to reproduce: 1. New a library. 2. Go to Master Page, resize the master page using the ruler. Expected result: 1. Layout works correctly. 2. No exception is thrown out. Error log: An unexpected internal exception occurred.Please see log for detail. Plug-in Provider:Eclipse.org Plug-in Name:BIRT Designer UI Plug-in ID:org.eclipse.birt.report.designer.ui Version:2.2.0.v20070606-0630 Error Code:Error.GUIException.invokedByUnexpectedException Error Message:org.eclipse.birt.report.designer.internal.lib.lalyout.LibraryReportDesignLayout
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/Module.java
* @param name
	 * @return
	 */
	public DesignElement findLevel( String name )
	{
		return resolveElement( name, null, MetaDataDictionary.getInstance( )
				.getElement( ReportDesignConstants.LEVEL_ELEMENT ) );
	}
	/**
	 * Returns the next element ID and increments the ID. Used to assign an ID
	 * to new elements.
	 * 
	 * @return The ID to assign to the new element.
	 */
	public long getNextID( )
	{
		return elementIDCounter++;
	}
	/**
	 * Adds an element to the id-to-element map. Does nothing if IDs are not
	 * enabled. Should be called only from the
	 * {@link org.eclipse.birt.report.model.command.ContentCommand ContentCommand}.
	 * 
	 * @param element
	 *            The new element to add.
	 */
	public void addElementID( DesignElement element )
	{
		assert idMap != null;
		assert element.getID( ) > 0;