I see some items in Finder show up as bold and I wonder what that means. The example I have attached is somewhere under
~/Library. It's the most recent place I've seen this, not the only place. It also happens outside of
~/ and its subdirectories. It looks like a feature more than a bug. I wondered if it had to do with Git (maybe MacOS High Sierra shows Git statuses in Finder by default the way Ubuntu does), but no. I wondered if it's a Time Machine thing too (i.e. files not yet backed up may be shown in bold). I don't have a definitive answer. I haven't seen this advertised as a feature anywhere on Apple's site or any similar questions in Apple's support site. If this is a feature, I'd really like to know what it's for.