code actions about next-ls HOT 4 CLOSED

we also could convert 'if' to/from inline version

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convert function call to pipe, convert pipe to function call

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Hi @mhanberg,

I guess, you can update the status of the following tasks

• mark unused variable with underscore

-- https://github.com/elixir-tools/next-ls/blob/v0.19.2/test/next_ls/extensions/elixir_extension/code_action/unused_variable_test.exs

• require module (like Logger)

-- https://github.com/elixir-tools/next-ls/blob/v0.19.2/test/next_ls/extensions/elixir_extension/code_action/require_test.exs

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Closing in favour of #434, #435, #438, #439

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