add border to floating window for documentation and autocomplete

lua/plugins/cmp.lua

@@ -0,0 +1,20 @@
+return {
+  "hrsh7th/nvim-cmp",
+  dependencies = { "hrsh7th/cmp-emoji" },
+  ---@param opts cmp.ConfigSchema
+  opts = function(_, opts)
+    local cmp = require("cmp")
+    opts.sources = cmp.config.sources(vim.list_extend(opts.sources, { { name = "emoji" } }))
+    cmp.setup({
+      window = {
+        completion = {
+          border = "single",
+          -- winhighlight = "Normal:Pmenu,FloatBorder:Pmenu,CursorLine:PmenuThumb,Search:None",
+        },
+        documentation = {
+          border = "single",
+        },
+      },
+    })
+  end,
+}