SoC ideas: fix 2398 wine bug

I would like to fix http://bugs.winehq.org/show_bug.cgi?id=2398 bug. 
On http://wiki.winehq.org/OpenGL there are some ideas how to do this 
and I think that this one with glViewport and glScissor is the best 
one. I wrote test program and I think it should work. What do you 
think about it and do you think that this idea has any chances in 
SoC?