feat: apply additional additionalTextEdits on confirm completion(#64)

Author: haorenW1025

lua/completion.lua

@@ -51,6 +51,17 @@ end
 function M.confirmCompletion()
   if M.completionConfirm == true then
     local complete_item = api.nvim_get_vvar('completed_item')
+    local lnum, _ = api.nvim_win_get_cursor(0)
+    local item = complete_item.user_data.lsp.completion_item
+    local bufnr = api.nvim_get_current_buf()
+    if item.additionalTextEdits then
+      local edits = vim.tbl_filter(
+        function(x) return x.range.start.line ~= (lnum - 1) end,
+        item.additionalTextEdits
+      )
+      vim.lsp.util.apply_text_edits(edits, bufnr)
+    end
+
     if vim.g.completion_enable_auto_paren == 1 then
       M.autoAddParens(complete_item)
     end