Take care of unanimated flag during creating opened branches

Hi!
while executing, for example, .loadFrom() method with { unanimated: true } option, plugin doesn't count on this option during creating opened branches (inodes with open: true). It's clear, that we can't just pass options argument as it's done in all other places, because in this case we will get infinite loop %) , but just passing this flag would be ok. 
I don't know is it enough for all use cases, or we need to pass all options, beside itemData, but anyway this is better then nothing.