internal: ensure a Salsa-ified crate graph works with project discovery #19523
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Fixes #19489.
The main part of this this change is going from a
self.proc_macro_clients.is_empty()
check to aself.proc_macro_clients.len() < self.workspaces.len()
. I also rewrote some iterator combinators in favor of twofor
loops and twomatch
statements because I had difficulty understanding the code.