AddLShortcutTest test covers the cases of shortcuts for additional launchers when shortcuts are requested for the main launcher.

It is missing the following test cases:
1. shortcuts are not requested for the main launcher but requested for additional launchers:
  1.1. On Windows: the desktop shortcut is requested and the start menu shortcut is not requested for the main launcher
  1.2. On Windows: the desktop shortcut is not requested and the start menu shortcut is requested for the main launcher
  1.3. On Windows: shortcuts are not requested for the main launcher
  1.4. On Linux: a shortcut is not requested for the main launcher

2. Configure shortcuts in predefined app image:
  2.1. Don't configure shortcuts the 2nd jpackage run using the predefined app image
  2.2. configure shortcuts in the 2nd jpackage run using the predefined app image
    2.2.1 On Windows and Linux: shortcuts are not requested for the main launcher
    2.2.2. On Windows: the desktop shortcut is requested and the start menu shortcut is not requested for the main launcher
    2.2.3. On Windows: the desktop shortcut is not requested and the start menu shortcut is requested for the main launcher

3. Test that when --linux-shortcut is set for the main launcher and not set for an additional launcher the additional launcher should not have a desktop file