Bug 229351 [Contributions] Customize Perspective dialog removes menu entires
I20080429-0100. (works in 3.4 M6a) 1. start fresh workspace 2. verify that the 'Edit' menu contains, e.g. Cut, Copy, Paste 3. Window > Customize Perspective... 4. click 'Cancel' (alternatively you can go and edit, then click 'OK') 5. observe: menu entries are gone from the 'Edit' menu The user has to restart in order to get the menu working again.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/WorkbenchActionBuilder.java
return menu;
    }
    /**
     * Creates and returns the Navigate menu.
     */
    private MenuManager createNavigateMenu() {
        MenuManager menu = new MenuManager(
                IDEWorkbenchMessages.Workbench_navigate, IWorkbenchActionConstants.M_NAVIGATE);
        menu.add(new GroupMarker(IWorkbenchActionConstants.NAV_START));
        menu.add(goIntoAction);
        MenuManager goToSubMenu = new MenuManager(IDEWorkbenchMessages.Workbench_goTo, IWorkbenchActionConstants.GO_TO);
        menu.add(goToSubMenu);
        goToSubMenu.add(backAction);
        goToSubMenu.add(forwardAction);
        goToSubMenu.add(upAction);
        goToSubMenu.add(new Separator(IWorkbenchActionConstants.MB_ADDITIONS));
        menu.add(new Separator(IWorkbenchActionConstants.OPEN_EXT));
        for (int i = 2; i < 5; ++i) {
            menu.add(new Separator(IWorkbenchActionConstants.OPEN_EXT + i));
        }
        menu.add(new Separator(IWorkbenchActionConstants.SHOW_EXT));
        {
			MenuManager showInSubMenu = new MenuManager(
					IDEWorkbenchMessages.Workbench_showIn, "showIn"); 
			showInSubMenu.setActionDefinitionId(showInQuickMenu
					.getActionDefinitionId());
			showInSubMenu.add(ContributionItemFactory.VIEWS_SHOW_IN
					.create(getWindow()));
			menu.add(showInSubMenu);
		}