Bug 75711 AstProvider should not create AST if requested by SelectionListenerWithASTManager
3.1 M2 If SelectionListenerWithASTManager waits for an AST and the editor closes we should not create an AST for that one but return null instead.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaEditor.java
*/
	public void synchronizeOutlinePageSelection() {
		synchronizeOutlinePage(computeHighlightRangeSourceReference());
	}
	
	
	/*
	 * Get the desktop's StatusLineManager
	 */
	protected IStatusLineManager getStatusLineManager() {
		IEditorActionBarContributor contributor= getEditorSite().getActionBarContributor();
		if (contributor instanceof EditorActionBarContributor) {
			return ((EditorActionBarContributor) contributor).getActionBars().getStatusLineManager();
		}
		return null;
	}	
	
	/*
	 * @see AbstractTextEditor#getAdapter(Class)
	 */
	public Object getAdapter(Class required) {
		
		if (IContentOutlinePage.class.equals(required)) {
			if (fOutlinePage == null)
				fOutlinePage= createOutlinePage();
			return fOutlinePage;
		}
		
		if (IEncodingSupport.class.equals(required))
			return fEncodingSupport;