It doesn't, but that would be an interesting feature to develop. Is this something you've used in another editor (iso grid)?

Rust doesn't really have anything super mature in terms of UI, though druid[0] is the one I'm keeping an eye on. Since there's very little "UI" per se in rx, it's currently built directly on top of the graphics layer[1].

[0]: https://github.com/xi-editor/druid

[1]: https://github.com/cloudhead/rgx