Make excess vended items appear on top

[phyvo]

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Right now getting a vended item works like this: first it checks your active hand, then it checks your inactive hand, then if both hands are full it puts the vended item on top of the vendor. But then if there's already an item there it starts stacking items *underneath* the vendor, often making it impossible to access those items without something like a laggy right click. There doesn't seem to me to be a good reason to do it this way, meanwhile it makes doing things like grabbing 10 teleporter components or 6 donuts more inconvenient.

Just an idea.