Revert "always flip the display when we switch contexts"
Revert "always flip the display when we switch contexts"

This reverts commit 901a7bc74995531a46e2f1aeb6d21e1d18ada25b.

HPI-SWA-Lab/RSqueak,HPI-SWA-Lab/RSqueak,HPI-SWA-Lab/RSqueak,HPI-SWA-Lab/RSqueak