Unicode completion often doesn't work

[aplavin]

I find that unicode completion often doesn't work in Pluto – simply refuses to complete a symbol. Some symbols never get completed, some get completed in some contexts but not in others.

I think that some long time ago the completion felt more reliable, but not 100% sure on that.

Here's a video, demonstrating Julia REPL behavior (always completes properly) vs Pluto behavior.

https://github.com/fonsp/Pluto.jl/assets/687995/87b2e460-2ba9-4bab-bfdb-f5138bbd6835