ACPI Shutdown shortcut conflicts with Hide global shortcut.

[Derek Schrock]

To execute ACPI via a keyboard shortcut you're to use HOST-h. In the Mac OS X case HOST is cmd and cmd-h is the Hide VirutalBox menu item from the application (VirutalBox) menu.

Reproduce:
1) Open VirtualBox on Mac OS X
2) Start a VM
3) Select the running VM
4) hit command-h (cmd-h)

Expected:
ACPI Shutdown command should be sent to the VM.

Actual:
The VirtualBox application is hidden.

[Frank Mehnert]

On Mac OS X, the shortcut for shutting down the VM via ACPI is Host+U.