- from <https://github.com/hrsh7th/nvim-cmp/wiki/Example-mappings#confirm-candidate-on-tab-immediately-when-theres-only-one-completion-entry>
- from <https://github.com/hrsh7th/nvim-cmp/wiki/Example-mappings#confirm-candidate-on-tab-immediately-when-theres-only-one-completion-entry>