window: remove the alpha size needed, because i am not able to tell why it is needed, and because it's failing for few users, let's remove it. Plus add a couple of informations about the GL window opened. closes #808
window: remove the alpha size needed, because i am not able to tell why it is needed, and because it's failing for few users, let's remove it. Plus add a couple of informations about the GL window opened. closes #808

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