Dear Maintainer,

I don't use full screen a lot, so I only notice it now. But in the SDL2 app
we're developing (openMSX, also in Debian, but this applies only to the current
development version, available on GitHub), the fullscreen mode is broken. So I
asked on #debian-next and there I see this:
<mooff> Quibus: just installed vonsh to test, and the fullscreen mode there seems broken too
<mooff> the canvas resizes but the window keeps the same position and size
<mooff> with nvidia-driver 450.80.2

So, it also happens with 'vonsh' which is already readily available and the
issue can thus be tested with that game.

My conclusion is then that it is most likely related to the nvidia driver. The
fullscreen in openMSX works fine on a Linux machine with an intel chip, for
instance. And also on Mac and Windows.

I know this is probably an upstream thing, just filing the bug here so everyone
can track it and document the issue.

Thanks for all your support on the driver!