WIP: windowManager: Fix fullscreen windows in ws switching animations
To prevent a small gap between windows in the workspace switching animation, we temporarily shift windows up or down by the height of the panel. This obviously breaks the animation for fullscreen windows, those will overlap with the ones on the other workspace since there is no panel shown in that case.
Fix this by checking whether the old or new workspace includes a fullscreen window and don't shift the windows if there is one.
Marked as WIP because this doesn't work well in all cases yet.