using alias breaks auto-completion and documentation on mouse-over

[ggerico]

Environment

Elixir 1.14.4 (compiled with Erlang/OTP 25)
Livebook 0.9.2

Current behavior

I was watching "Data wrangling in Elixir with Explorer, the power of Rust, the elegance of R - Launch Week 1 - Day 5" and found out that when using aliases, auto-completion and documentation on mouse-over are both not working

require Explorer.DataFrame, as: DF
DF.load_csv!(resp.body)

after typing DF. auto-completion doesn't pop up
after typing DF.load_csv!(res.body) mouse over load_csv! doesn't show its doc

Expected behavior

auto-completion and documentation on mouse-over should show up

without using aliases, both functionalities are working well

[josevalim]

This is a known issue. We only use aliases defined in the previous cell. Once we add more functionality to help with this in Elixir (elixir-lang/elixir#12566), we can provide it here too. :)