[PyMOL] `selection` argument in load_traj

[Lorenzo G. <br...@gm...>]

Dear pymol users,

What is the purpose of the `selection` argument in the `load_traj` command?

My intuition would say that it allows to somehow select which atoms to load
into pymol before the actual loading happens. However, it seems to do
nothing whatsoever. What am I missing?

Thanks,
Lorenzo