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Remove the extra Render performed by the interactor on WM_PAINT.

Xabi requested to merge Xabi/vtk:release-6.3-double-win32Interactor-render into master

There is a double rendering on WM_PAINT, one called in vtkWin32RenderWindowInteractor::vtkHandleMessage2 and one in vtkWin32OpenGLRenderWindow::MessageProc.

The interactor render is removed, it will only fire the RenderEvent.

For example, resize a render window and you can see the double rendering.

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