I think that is precisely why people, and myself, ate happy with Zed. I don't, personally, care for those kinds of features. I want something that is snappy, and bloat free. I beloved extensions are planned so that will come in time. I'm terms of inline error highlighting, it absolutely has that. is your LSP just not working correctly?
I don't know, I can't tell, but I would guess it does not. I just got the one and only Java extension there is (the other has has something to do with Eclipse). Yet, no error highlighting.
