Set a limit to how wide the completion menu can be

lua/plugins/completions.lua

@@ -139,6 +139,20 @@ return {
         { name = 'git' },
       },
 
+      formatting = {
+        format = function(entry, vim_item)
+          -- Set a limit to how wide the completion menu can be
+          local winwidth = vim.fn.winwidth(vim.api.nvim_get_current_win())
+          local menuwidth = math.min(winwidth / 2, 70)
+          if menuwidth < 70 then
+            vim_item.menu = ''
+            vim_item.kind = ''
+          end
+          vim_item.abbr = string.sub(vim_item.abbr, 1, menuwidth)
+          return vim_item
+        end
+      },
+
       window = {
         completion = cmp.config.window.bordered(),
         documentation = cmp.config.window.bordered(),