From Paul Martz: Branch of the 2.8.2 release to add workaround for issue on OS X NVIDIA driver 1.5.49. glBlitFramebuffer on both color and depth locks the OS X desktop. Fix is a CMake-controlled switch, when enabled, the glBlitFramebuffer does not blit depth. This produces acceptable results because apps doing RTT generally don't need to resolve MSFBO to depth.
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