Chaining the :root selector and OOMs #2701
Description
Hi! I was wondering what'd happen if I used :root multiple times in a selector, and it turns out it's quite heavy.
An expression like :root(*):root(*) takes my machine about 2 seconds to run on a model with just the Smithy prelude, and :root(*):root(*):root(*) makes it instantly try to use all the available memory on the machine (I see heaps of over 16 gigs and counting, then OOMing).
Seems like something is off with the implementation - :root is clearly not like the other functions, but using it thrice shouldn't cause such drastic outcomes as an OOM.