Bug 88352 Operation supports leaks contexts via action handler
I20050315-1100 Susan, this is a different leak from the one that I reported. Test Case: 1. open text editor 2. close text editor ==> DefaultUndoManager is leaked due to undo/redo actions handlers still holding on to the context.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/navigator/ResourceNavigator.java
public boolean isLinkingEnabled() {
        return linkingEnabled;
    }
    /**
     * Brings the corresponding editor to top if the selected resource is open.
     * 
     * @since 2.0
     */
    protected void linkToEditor(IStructuredSelection selection) {
        Object obj = selection.getFirstElement();
        if (obj instanceof IFile && selection.size() == 1) {
            IFile file = (IFile) obj;
            IWorkbenchPage page = getSite().getPage();
            IEditorPart editor = ResourceUtil.findEditor(page, file);
            if (editor != null) {
                page.bringToTop(editor);
                return;
            }
        }
    }
    /**
     * Creates the action group, which encapsulates all actions for the view.
     * Installs global action handlers for undo and redo.
     */
    protected void makeActions() {
        setActionGroup(new MainActionGroup(this));
        createGlobalActionHandlers();
    }
    /**
     * Migrates the dialog settings from the UI plugin store to the