I think I agree that quidquid cannot normally be split up; but is that reason enough to say it must be one word? The particle -que cannot normally be split up either, but it is split up occasionally in poetry, if I remember correctly. I think what constitutes a word and what doesn’t is ultimately an unreclaimable quagmire, though in this case I’d certainly prefer quidquid over quid quid too.
I think I agree that quidquid cannot normally be split up; but is that reason enough to say it must be one word? The particle -que cannot normally be split up either, but it is split up occasionally in poetry, if I remember correctly. I think what constitutes a word and what doesn’t is ultimately an unreclaimable quagmire, though in this case I’d certainly prefer quidquid over quid quid too.