[vtkusers] VTK 6.3/OGL2/Qt5.3.2 : QVTKWidget regression, crash after "reparenting" a widget on OSX

[Simon ESNEAULT]

Hello,

After the switch to the new rendering backend, we have a crash on our
program after reparenting a QVTKWidget on OSX. The crash is in the
method vtkShaderProgram::FindUniform() but we suspect it is about the
OpenGL context not being ready on time for the next paintEvent with the new
parent.

Attached is a program that reproduce the problem, as well as a complete
backtrace for this crash. This used to work fine with the previous backend.

Hope this little test case helps

Thanks
Simon

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Simon Esneault
Rennes, France
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