Switching from an onscreen glx context to an osmesa context

Hello,

I've taken on the task of upgrading from mesa 7.6.1 to 7.10.3 and come
across what seems to be a regression.  I'm building on linux_x86-64 with gcc
4.5.1 and the following config:
configure --prefix=/u/vm-RHwin7-pa03/people/paulg/clones/install/mesa/
--with-driver=xlib --disable-gles1 --disable-gles2 --disable-egl
--disable-gallium
The problem happens when I switch between a mesa glx context to a osmesa
context, the OSMesaMakeCurrent succeeds but ends up using the onscreen glx
context for rendering.  The basic sequence of calls is as follows:

glxCreateContext
glxMakeCurrent
... OpenGL commands ...
OSMesaCreateContext
OSMesaMakeCurrent
... OpenGL commands ...  <-- these commands render single buffered on the
previous context.

I can workaround this by inserting a glxDestroyContext before the
OSMesaMakeCurrent but I'm switching between the contexts in a loop so I'm
hoping there is something I'm missing.  Any ideas?  This was not a problem
in 7.6.1 but maybe I just got lucky.

Any help is appreciated.

Regards,
Paul

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