This code now expects to wrok from fully evaluated data, however when we
keep original, we are actually working from data just copied from orig
one.
Ideally, we'd do a single depsgraph update/eval *after* we have created
all new required data, but that is tricky to do properly in that code
without risking breaking one thing or another.
So for now, just going for the simple, if not optimal solution, and just
repeatedly re-evaluating whole deg every time we duplicate an object to
be converted. Yep, dummy, but simple and... safe. ;)
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