[vtk-developers] Patch to silence needless error message

[Prabhu Ramachandran]

Hi,

When rendering offscreen using osmesa vtkXOpenGLRenderWindow.cxx keeps 
generating an annoying error message (this can be seen even in the test 
output on the dashboards).  PFA a patch to fix this.  I would really 
appreciate it if this (or perhaps something better) would be checked in 
before the 5.4 release.  Thanks also to those who made it possible to 
use osmesa in the first place, it is really convenient.

Thanks!

cheers,
prabhu
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