Feature Request: Support folding range source code

[wingyplus]

The original issue come from elixir-lsp/elixir-ls#358, start from support do/end block would be good. Love to hear your feedback.

NOTE: I have a prototype version on ElixirLS that use :elixir_tokenizer here wingyplus/elixir-ls@2d9a94c.

[axelson]

Code folding would be great to have! Although for the implementation it would be best to not rely on :elixir_tokenizer because it is a private elixir implementation detail and may change significantly between elixir versions (which would cause elixir_sense to break).

[wingyplus]

Code folding would be great to have! Although for the implementation it would be best to not rely on :elixir_tokenizer because it is a private elixir implementation detail and may change significantly between elixir versions (which would cause elixir_sense to break).

@axelson I have recommended that uses ElixirSense.Core.Normalized.Tokenizer is better than using :elixir_tokenizer directly (refer to this comment elixir-lsp/elixir-ls#358 (comment)). Love to see another way to do it. :)

[lukaszsamson]

Closing in favour of elixir-lsp/elixir-ls#492