[vtkusers] small bug in startpick() method

[Jeff Lee]

If you could provide some code which demonstrates a problem, that would 
be good, I use multiple renderers all the time and picking works great. 
 What is your problem specifically?
-Jeff

Anthony Sherbondy wrote:

>Hello,
>
>The startpick() method in vtkOpenGLRenderer does not call MakeCurrent()
>before accessing openGL.  I believe this is a bug as it seems to cause me
>many problems when I attempt to interact with multiple windows.  If I add
>MakeCurrent() at the beginning of this function there is no problem.
>
>-Tony
>
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