Why does E565 error invoke when I executes require('luasnip.extras.select_choice() in blink.cmp?

[Jaehaks]

I am using blink.cmp and set ui_select true in configuration of snacks.nvim
When I call require('luasnip.extras.select_choice'), error occurs like this.,

E5108: Error executing lua: ...ER/.config/nvim-data/lazy/snacks.nvim/lua/snacks/win.lua:705: E565: Not allowed to change text or change window 
stack traceback:
[C]: in function 'nvim_open_win'
...ER/.config/nvim-data/lazy/snacks.nvim/lua/snacks/win.lua:705: in function 'open_win'
...ER/.config/nvim-data/lazy/snacks.nvim/lua/snacks/win.lua:810: in function 'show'
....config/nvim-data/lazy/snacks.nvim/lua/snacks/layout.lua:242: in function 'update'
....config/nvim-data/lazy/snacks.nvim/lua/snacks/layout.lua:555: in function 'show'
...-data/lazy/snacks.nvim/lua/snacks/picker/core/picker.lua:519: in function 'show'
...-data/lazy/snacks.nvim/lua/snacks/picker/core/picker.lua:777: in function 'update'
...data/lazy/snacks.nvim/lua/snacks/picker/core/matcher.lua:94: in function 'run'
...-data/lazy/snacks.nvim/lua/snacks/picker/core/picker.lua:867: in function 'find'
...-data/lazy/snacks.nvim/lua/snacks/picker/core/picker.lua:153: in function 'select'
...m-data/lazy/LuaSnip/lua/luasnip/extras/select_choice.lua:18: in function 'command'
.../nvim-data/lazy/blink.cmp/lua/blink/cmp/keymap/apply.lua:26: in function <.../nvim-data/lazy/blink.cmp/lua/blink/cmp/keymap/apply.lua:16>   

in blink.cmp, I configure the keymap like this

['<C-p>'] = {
  function(cmp)
    if require('luasnip').expand_or_locally_jumpable() then
      return require('luasnip.extras.select_choice')()
        -- return utils.CalloutSnippet()
      else
        return cmp.snippet_forward()
      end
    end,
  'fallback',
},

self.buf, enter, opts in nvim_open_win() is ok as I think.
but I cannot find any clue about why this happens.
Has anyone else experienced this?

[drowning-cat]

1. I'm not sure why this error occurs:

   repro.lua

   vim.env.LAZY_STDPATH = '.repro'
   load(vim.fn.system 'curl -s https://raw.githubusercontent.com/folke/lazy.nvim/main/bootstrap.lua')()
   
   ---@module 'snacks'
   ---@module 'blink.cmp'
   
   -- Steps:
   --   1. nvim -u repro.lua repro.lua
   --   2. expand trig~ with <C-y>
   --   3. Press <C-a>
   
   require('lazy.minit').repro { ---@diagnostic disable-line
     spec = {
       {
         'folke/snacks.nvim',
         ---@type snacks.Config
         opts = {
           picker = {
             ui_select = true,
           },
         },
       },
       {
         'saghen/blink.cmp',
         build = 'cargo build --release',
         dependencies = {
           { 'L3MON4D3/LuaSnip', version = 'v2.*' },
         },
         ---@type blink.cmp.Config
         opts = {
           snippets = { preset = 'luasnip' },
           sources = {
             default = { 'lsp', 'path', 'snippets', 'buffer' },
           },
           keymap = {
             preset = 'default',
             ['<C-a>'] = {
               function(cmp)
                 if require('luasnip').expand_or_locally_jumpable() then
                   require 'luasnip.extras.select_choice'()
                   return true
                 else
                   return cmp.snippet_forward()
                 end
               end,
               'fallback',
             },
           },
         },
         config = function(_, opts)
           require('blink.cmp').setup(opts)
   
           local ls = require 'luasnip'
           local s = ls.snippet
           local t = ls.text_node
           local i = ls.insert_node
           local f = ls.function_node
           local c = ls.choice_node
   
           require('luasnip').add_snippets('lua', {
             s(
               'trig',
               c(1, {
                 t 'Ugh boring, a text node',
                 i(nil, 'At least I can edit something now...'),
                 f(function()
                   return 'Still only counts as text!!'
                 end, {}),
               })
             ),
           })
         end,
       },
       {
         'mason-org/mason.nvim',
         build = ':MasonUpdate',
         opts = {},
       },
       {
         'mason-org/mason-lspconfig.nvim',
         dependencies = { 'mason-org/mason.nvim', 'neovim/nvim-lspconfig' },
         opts = {
           ensure_installed = { 'lua_ls' },
         },
       },
     },
   }

2. You can patch the code with:

   function(cmp)
     if require('luasnip').expand_or_locally_jumpable() then
       vim.schedule(function()
         require 'luasnip.extras.select_choice'()
       end)
       return true
     else
       return cmp.snippet_forward()
     end
   end,

[drowning-cat]

Maybe it has something to do with blink.cmp using vim.on_key(). I don't think it's a snacks.nvim bug.

[Jaehaks]

Thanks for solution, the vim.schedule works for me.
After repro.lua, I'll create an issue for it.