This directly adress the issues caused by rB536c2e0ec916. Since the state tracking is done at a lower level, using the bgl functions needs to be safegarded by the state manager. The current workaround is to bypass `apply_state` when inside a callback that used a `bgl` function. Related to T80730. This fix T81003. Also this fix the default blend equation for callbacks. Fixes T80169 T81289.