KDE Active Screen Edge Actions of host are not disabled when running a guest OS in full screen mode

[Felix Kuehnl]

When running a virtual machine in full screen mode (Host Key + F) under KDE on a Linux host, the Active Screen Edge Actions as configured in System Settings -> Workspace -> Desktop Behavior -> Screen Edges are still triggered by KDE when moving the mouse pointer into the respective corner. This collides with similiar functions of the guest desktop environment (e.g. when running a KDE guest on a KDE host). For example when setting the upper left corner to "Lock Screen" or "Present Windows - All Desktops", moving the mouse courser into the upper left corner inside a guest machine triggers the respective action of the host machine.

When running a virtual machine in full screen mode, host features such as KDE Active Screen Edges should be disabled by VirtualBox.

I tested VirtualBox 5.0.24_RPMFusion r108355 under Fedora 23 with KDE 5.6.5 as well as VirtualBox 5.1.0 r108711 on Kubuntu 16.04 Xenial with KDE 5.5.5. The guest systems I used where Ubuntu 16.04 Xenial and Fedora 24 on the first host, and Ubuntu 16.04 Xenial on the second one, all with Guest Additions installed.