refactor(nvim): improve cmp sorting

dots/.config/nvim/lua/plugins/configs/cmp.lua

@@ -341,15 +341,24 @@ return {
                 sorting = {
                     priority_weight = 2,
                     comparators = {
-                        require("cmp_fuzzy_buffer.compare"),
-                        compare.score,
-                        compare.offset,
+                        compare.locality,
                         compare.recently_used,
+                        compare.score,
+                        require("cmp_fuzzy_buffer.compare"),
+                        compare.offset,
                         compare.exact,
-                        compare.kind,
-                        compare.sort_text,
-                        compare.length,
-                        compare.order,
+                        -- Copied from cmp-under-comparator
+                        function(entry1, entry2)
+                            local _, entry1_under = entry1.completion_item.label:find "^_+"
+                            local _, entry2_under = entry2.completion_item.label:find "^_+"
+                            entry1_under = entry1_under or 0
+                            entry2_under = entry2_under or 0
+                            if entry1_under > entry2_under then
+                                return false
+                            elseif entry1_under < entry2_under then
+                                return true
+                            end
+                        end,
                     },
                 },
             })