Bug 25827 Disposing of MemberFilterActionGroup
Build 2.0.2 and 2.1 When investigating an editor memory leak PR we found out that this group has a dispose method which is never called. When we then called from the editor it throw an exeption (viewer was disposed). Don't know if the group really needs dispose() if so it should get called.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaOutlinePage.java
/*
	 * @see Page#setFocus()
	 */
	public void setFocus() {
		if (fOutlineViewer != null)
			fOutlineViewer.getControl().setFocus();
	}
	
	/**
	 * Checkes whether a given Java element is an inner type.
	 */
	private boolean isInnerType(IJavaElement element) {
		
		if (element.getElementType() == IJavaElement.TYPE) {
			IJavaElement parent= element.getParent();
			int type= parent.getElementType();
			return (type != IJavaElement.COMPILATION_UNIT && type != IJavaElement.CLASS_FILE);
		}
		
		return false;		
	}
	
	/**
 	 * Handles key events in viewer.
 	 */
	private void handleKeyReleased(KeyEvent event) {
		
		if (event.stateMask != 0)
			return;