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QVTKOpenGLWidget: alpha blending issue

Utkarsh Ayachit requested to merge utkarsh.ayachit/vtk:qvtkopenglwidget_fixes into master

A more robust approach to addressing QVTKOpenGLWidget's propensity to blend into desktop background. If the framebuffer has non-1 alpha, Qt 5 ends up blending into the desktop causing bleed throughs.

Now we clear the alpha buffer entirely in each paintGL call and fill it with 1.

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