fix(cmp): set default group_index to 1 to prevent issues with custom sources

lua/lazyvim/plugins/coding.lua

@@ -71,12 +71,13 @@ return {
             fallback()
           end,
         }),
-        sources = {
-          { name = "nvim_lsp", group_index = 1 },
-          { name = "luasnip", group_index = 1 },
-          { name = "buffer", group_index = 2 },
-          { name = "path", group_index = 2 },
-        },
+        sources = cmp.config.sources({
+          { name = "nvim_lsp" },
+          { name = "luasnip" },
+          { name = "path" },
+        }, {
+          { name = "buffer" },
+        }),
         formatting = {
           format = function(_, item)
             local icons = require("lazyvim.config").icons.kinds
@@ -94,6 +95,13 @@ return {
         sorting = defaults.sorting,
       }
     end,
+    ---@param opts cmp.ConfigSchema
+    config = function(_, opts)
+      for _, source in ipairs(opts.sources) do
+        source.group_index = source.group_index or 1
+      end
+      require("cmp").setup(opts)
+    end,
   },
 
   -- auto pairs