Doiron: Would be nice but thats a myth
Most drivers today default to tripple buffering, if that is not enabled fast GPUs can create a chain of up to 7 backbuffers (-> this is the cause for BMs mouse latency issue back a few versions ago)
The only thing you can guarantee is that it is noobish stupid behavior to missassume (out of missing knowledge) that the frontbuffer will be the same when you flip twice. Because even if it is the same buffer, it does not mean that it hasn't been cleaned or modified through other effects, there is no consistency guarantee for a flipchain buffer after you disabled it (-> after flip)
Most drivers today default to tripple buffering, if that is not enabled fast GPUs can create a chain of up to 7 backbuffers (-> this is the cause for BMs mouse latency issue back a few versions ago)
The only thing you can guarantee is that it is noobish stupid behavior to missassume (out of missing knowledge) that the frontbuffer will be the same when you flip twice. Because even if it is the same buffer, it does not mean that it hasn't been cleaned or modified through other effects, there is no consistency guarantee for a flipchain buffer after you disabled it (-> after flip)