VM window should stay maximized when moving to a screen with a different resolution

[gregv]

VirtualBox: 4.3.20 r96997

Host: Windows 8.1 Enterprise 64-bit

Guest: Windows 7 Enterprise 64-bit

Problem: I am running VirtualBox on a laptop with a secondary monitor connected via a display-port to VGA adapter coming out of the laptop and VGA in on the monitor. The resolution of the laptop is 3200x1800 and the resolution of the secondary monitor is 1680x1050. When I move the guest machine from the laptop screen to the secondary monitor I expect the VirtualBox window to resize to the new resolution but it does not. All other applications do this. This is a bit confusing to explain but bear with me here...

Example: I start Virtualbox and start my guest machine. These windows are on my laptop screen and maximized, so running at 3200x1800. I move the guest machine window over to my secondary monitor but the window does not resize. I believe the window is still running at 3200X1800 instead of resizing to 1680x1050 when moved. This is causing issues because the guest machine is pretty much unusable as everything is at a very high resolution but running on a monitor that does not have that resolution. I can adjust the window or the resolution of the guest machine, but nothing changes. The window still is running at 3200x1800 thus causing the guest machine to appear very tiny.

[gregv]

vbox log

[gregv]

vbox startup log

[Frank Mehnert]

Adapted the summary of this defect, I hope that's more appropriate.