lsp completion selection behaviour now more similar to default vim completion.

- Selecting completion items now changes text in the buffer directly
  without having to confirm it with <C-y>.

.config/nvim/after/plugin/lsp.lua

@@ -1,4 +1,14 @@
 local lsp = require('lsp-zero').preset({})
+local cmp = require('cmp');
+
+-- Set the lsp autocomplete to put text from selection into the buffer.
+--
+-- This setup_nvim_cmp function is deprecated, though this seems to be
+-- the cleanest solution as of lsp-zero v2.x. A fallback solution is 
+-- commented out below.
+lsp.setup_nvim_cmp({
+	select_behavior = cmp.SelectBehavior.Insert
+})
 
 vim.diagnostic.config({
 	virtual_text = true
@@ -16,3 +26,29 @@ end)
 require('lspconfig').lua_ls.setup(lsp.nvim_lua_ls())
 
 lsp.setup()
+
+-- Below commented code is a fallback for when the setup_nvim_cmp()
+-- is gone
+--
+-- This is adapted from the defaults provided by lsp-zero
+-- - see https://github.com/VonHeikemen/lsp-zero.nvim/blob/v2.x/lua/lsp-zero/cmp.lua
+--
+--local select_opts = { behavior = cmp.SelectBehavior.Insert }
+--cmp.setup({
+--	mapping = {
+--		['<C-p>'] = cmp.mapping(function()
+--			if cmp.visible() then
+--				cmp.select_prev_item(select_opts)
+--			else
+--				cmp.complete()
+--			end
+--		end),
+--		['<C-n>'] = cmp.mapping(function()
+--			if cmp.visible() then
+--				cmp.select_next_item(select_opts)
+--			else
+--				cmp.complete()
+--			end
+--		end),
+--	}
+--})