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
textWidget.setKeyBinding(SWT.CTRL | SWT.ARROW_RIGHT, SWT.NULL);
							
		action= new SelectPreviousSubWordAction();
		action.setActionDefinitionId(ITextEditorActionDefinitionIds.SELECT_WORD_PREVIOUS);
		setAction(ITextEditorActionDefinitionIds.SELECT_WORD_PREVIOUS, action);
		textWidget.setKeyBinding(SWT.CTRL | SWT.SHIFT | SWT.ARROW_LEFT, SWT.NULL);
		
		action= new SelectNextSubWordAction();
		action.setActionDefinitionId(ITextEditorActionDefinitionIds.SELECT_WORD_NEXT);
		setAction(ITextEditorActionDefinitionIds.SELECT_WORD_NEXT, action);
		textWidget.setKeyBinding(SWT.CTRL | SWT.SHIFT | SWT.ARROW_RIGHT, SWT.NULL);
	}
	/*
	 * @see org.eclipse.ui.texteditor.AbstractDecoratedTextEditor#createCompositeRuler()
	 */
	protected CompositeRuler createCompositeRuler() {
		if (!getPreferenceStore().getBoolean(PreferenceConstants.EDITOR_ANNOTATION_ROLL_OVER))
			return super.createCompositeRuler();
		
		CompositeRuler ruler= new CompositeRuler();
		AnnotationRulerColumn column= new AnnotationRulerColumn(VERTICAL_RULER_WIDTH, getAnnotationAccess());
		column.setHover(new JavaExpandHover(ruler, getAnnotationAccess(), new IDoubleClickListener() {
			public void doubleClick(DoubleClickEvent event) {
				
				triggerAction(ITextEditorActionConstants.RULER_DOUBLE_CLICK);
			}
			
			private void triggerAction(String actionID) {
				IAction action= getAction(actionID);
				if (action != null) {