> There's no need to intersect the partial_update region with the > scissor, since rendering outside of the partial_update area is > explicitly undefined.
I think the idea is less about need and more about an extra optimization. *Because* that outside rendering is explicitly undefined, it's valid for us to scissor it out and save bandwidth later, even if the app is too lazy to scissor itself. (Well-behaved apps should *also* scissor explicitly but you know, undefined means we can do whatever is fastest).
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