I’ve updated the open source
FloatingFilter package to finally have rounded corners. The old corners looked especially out of place on Big Sur, but fit Catalina and older macOS versions, too.
I believe I never announced the development of this library in the past. It’s used in The Archive to show a floating selector for external editors, and will also be a prominent feature of stuff I’m working on. It’s a general purpose “select with fuzzy matching from a list of things” tool.
FloatingFilter on GitHub