VirtualBox: 6.0.0_BETA2 r126930 (Qt5.6.3)
Guest OS: Any, but all VMs are set to 1280x1024
Computer: MBPr 15" HiDPI, 2880x1800 theor., 1920x1200 effective
2nd monitor: 1280x1024 non HiDPI
GUI/ScaleFactor: 2
- Start VM in screen 1, the MBP native 1980x1200.
- Take the VM full-screen on screen 2, the 1280x1024 one.
- The VM isn't scaled at all, because it's already set at 1280x1024.
- Take it out of full-screen, the VM window returns to screen 1.
- The size of the window remains 1280x1024, but the contents are scaled x2, magnified.