Bug 275171 [Contributions] Customize Perspective action breaks editor pinning action
Using M7, I enabled editor pinning (i.e. Reuse editor) and pinned an editor using an action in the toolbar. I then disabled editor pinning ad then opened the customized perspective dialog. After this, enabling/disabling editor pinning does not make the Pin Editor action reappear.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/WorkbenchActionBuilder.java
* Adds the perspective actions to the specified menu.
     */
    private void addPerspectiveActions(MenuManager menu) {
        {
            String openText = IDEWorkbenchMessages.Workbench_openPerspective;
            MenuManager changePerspMenuMgr = new MenuManager(openText,
                    "openPerspective"); 
            IContributionItem changePerspMenuItem = ContributionItemFactory.PERSPECTIVES_SHORTLIST
                    .create(getWindow());
            changePerspMenuMgr.add(changePerspMenuItem);
            menu.add(changePerspMenuMgr);
        }
        {
            MenuManager showViewMenuMgr = new MenuManager(IDEWorkbenchMessages.Workbench_showView, "showView"); 
            IContributionItem showViewMenu = ContributionItemFactory.VIEWS_SHORTLIST
                    .create(getWindow());
            showViewMenuMgr.add(showViewMenu);
            menu.add(showViewMenuMgr);
        }
        menu.add(new Separator());
        menu.add(editActionSetAction);
        menu.add(savePerspectiveAction);
        menu.add(resetPerspectiveAction);
        menu.add(closePerspAction);
        menu.add(closeAllPerspsAction);
    }
    /**
     * Adds the keyboard navigation submenu to the specified menu.
     */
    private void addWorkingSetBuildActions(MenuManager menu) {