electron: Menu enabled/visible property doesn't affect top-level menu items

• Electron version: 1.4.15
• Operating system: macOS Sierra, Windows 10

Expected behavior

Top level menu items should be hidden when the visible property is false and not be clickable when enabled property is false.

Actual behavior

The visible and enabled properties do not behave correctly on top level menu items. It seems to work correctly for submenu items.

How to reproduce

Create a menu with this code:

const { Menu } = require('electron').remote;

const template = [
  {
    label: 'Should not be visible',
    visible: false,
    submenu: [
      {
        label: 'Should not be visible either',
        visible: false
      }
    ]
  },
  {
    label: 'Should not be enabled',
    enabled: false,
    submenu: [
      {
        label: 'Should not be enabled either',
        enabled: false
      }
    ]
  },
];

const menu = Menu.buildFromTemplate(template);

Menu.setApplicationMenu(menu);

Both menu items will still be visible and clickable.