fix: truncate for builtin.buffers

fix #2022

lua/telescope/make_entry.lua

@@ -484,8 +484,9 @@ function make_entry.gen_from_buffer(opts)
   local cwd = vim.fn.expand(opts.cwd or vim.loop.cwd())
 
   local make_display = function(entry)
+    -- bufnr_width + modes + icon + 3 spaces + : + lnum
+    opts.__prefix = opts.bufnr_width + 4 + icon_width + 3 + 1 + #tostring(entry.lnum)
     local display_bufname = utils.transform_path(opts, entry.filename)
-
     local icon, hl_group = utils.get_devicons(entry.filename, disable_devicons)
 
     return displayer {