FEXLoader: Add some debug-only tracking for FEX owned FDs #3507
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I remember seeing some application last year where they closed a FEX owned FD but now I don't remember what it was. This can really mess us up so add some debug tracking so we can try and find it again.
Might be something specifically around flatpack, appimage, or chrome's sandbox. I have some ideas about how to work around these problems if they crop up but need to find the problem applications again.