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I believe that if you already have GDM with GNOME, installing Xfce won't necessarily bring in LightDM. If it does, it won't remove GDM, and you can always switch back to it:

$ sudo systemctl --force disable ldm.service

$ sudo systemctl --force enable gdm.service

I've had the exact opposite problem. My system "began" its life with Xfce, and I added GNOME and GDM later. Now I can't switch back to GDM -- I always get an error. But I like GDM well enough, so I'm happy enough to keep it as my login manager.