The sort button absolutely shouldn't sort subfolders. I do think there should be an option to always automatically sort alphabetically, though
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Why shouldn't subfolders be alphabetical? It's logical.
Because people could want them in a specific manual order other than using the alphabet. Well, you could put a number as prefix to order them, I know, just pointing the fact.
But that same logic should apply to top level folders. It doesn't make sense to on have some folders alphabetized but not others.
There should be an option for the cascading sorting but it shouldn't be default. I want to change the things I am interacting with in that moment and not something way down. Maybe there was a reason not to sort it alphabetical.