Comment # 37 on bug 1178360 from Stefan Hundhammer

Please look at that screenshot again:

https://bugzilla.opensuse.org/attachment.cgi?id=843222

The first green pixel line starts with a black portion. That is exactly how
much the rest of the X11 screen is offset to the right. In the vertical
dimension, the black part is exactly how much it's offset downwards.

When you look at the visible part of the Xfce screenshot utility at the bottom
part of that X11 screen, you will see that the screenshot it took inside that
VM is correct; there is no pixel garbage, and the icons are lined up correctly
at the left top corner.

So for the X server inside the VM, everything is alright (AFAICS). It must be
somewhere in the communication protocol between the VM guest and the host.