Improve the sorting order of completion items

[dbanck]

Context

With the introduction of functions, we now have many more completion items. By default, VS code sorts them alphabetically, so a user needs to scroll through a long list of function names before getting to variable references (var.).

It might be helpful to show "more important" things first, before listing everything else alphabetically. What would be an ideal order here? Maybe we can collect some feedback and discuss different approaches.

Proposal

• See if we need to introduce some sorting by priority, like displaying variable references first