fixed #3 by moving the call to make current to the top of snapshot

function to prevent the push calls being made without a valid context or a different context than the pop calls.

fixes #3

see https://www.graphics.rwth-aachen.de:9000/OpenFlipper-Free/OpenFlipper-Free/merge_requests/304 for build information

changed title from fixed #3 by moving the call to make curront to the top of snapshot to fixed #3 by moving the call to make current to the top of snapshot

changed the description

merged

mentioned in commit 81dcb260