Implement a keyboard shortcut key to minimize a fullscreen VirtualBox VM guest window

[3F776B3E]

When a VirtualBox VM client is running with a fullscreen window, minimizing it is done with the mouse touching the bottom of the screen and clicking the minimize button when the toolbar appears, or pressing Host+F to leave fullscreen mode and minimizing it.

Both ways are cumbersome when working with a fullscreen VM and switching between the guest and host frequently.

A keyboard shortcut to minimize the guest window should be nice, without needing to use the mouse or leaving fullscreen mode.