Bug 169393 Outline switch action isn't disappear after double clicking the Matser Page element on report outline
Open a report design, and active the improved XML editor, double click the master page element on report outline. Then, it will switch to the MasterPage editor, and the outline switch action isn't disappear on toolbar menu on outline view.
UI/org.eclipse.birt.report.designer.ui.editors/src/org/eclipse/birt/report/designer/ui/editors/MultiPageReportEditor.java
MultiPageSelectionProvider
	{
		private ISelection globalSelection;
		/**
		 * @param multiPageEditor
		 */
		public FormEditorSelectionProvider( FormEditor formEditor )
		{
			super( formEditor );
		}
		public ISelection getSelection( )
		{
			IEditorPart activeEditor = ( (FormEditor) getMultiPageEditor( ) ).getActivePageInstance( );
			
			if ( activeEditor != null )
			{
				ISelectionProvider selectionProvider = activeEditor.getSite( )
						.getSelectionProvider( );
				if ( selectionProvider != null )
					return selectionProvider.getSelection( );
			}
			return globalSelection;
		}
		/*
		 * (non-Javadoc) Method declared on <code> ISelectionProvider </code> .
		 */
		public void setSelection( ISelection selection )
		{
			IEditorPart activeEditor = ( (FormEditor) getMultiPageEditor( ) ).getActivePageInstance( );
			if ( activeEditor != null )