[Bug 43969] openGL SwapBuffers with NULL context

https://bugs.winehq.org/show_bug.cgi?id=43969

--- Comment #2 from JP Cimalando  ---
There is a binary, I have just compiled one however it's a Vst plugin, not the
easiest thing to debug. But it can reproduce this bug, which took me some
tedious time to trace.
I have tried to reproduce the bug in a small program, but couldn't, so the
particular context must be important. I have made a debug version which has two
dlls: a working one and a crashing one with null context. I load this in
dssi-vst on Linux, Hermann Seib's vsthost on Windows.