Mapped confirm character breaks completion

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Minimal reproducible full config

local lazypath = vim.fn.stdpath("data") .. "/lazy/lazy.nvim"
if not vim.loop.fs_stat(lazypath) then
    vim.fn.system({
        "git",
        "clone",
        "--filter=blob:none",
        "https://github.com/folke/lazy.nvim.git",
        "--branch=stable", -- latest stable release
        lazypath,
    })
end
vim.opt.rtp:prepend(lazypath)

-- Add mapping for (
vim.keymap.set('i', '(<Tab>', '()')

require("lazy").setup({
    {
        "hrsh7th/nvim-cmp",
        event = "InsertEnter",
        dependencies = {
            "hrsh7th/cmp-nvim-lsp",
            "hrsh7th/cmp-buffer",
        },
        config = function()
            local cmp = require'cmp'
            local insert_mapping = cmp.mapping.preset.insert({})
            cmp.setup({
                mapping = insert_mapping,
                confirmation = {
                    -- Confirm using '('
                    get_commit_characters = function(commit_characters) return {'('} end,
                },
                sources = cmp.config.sources( { { name = 'buffer' } } )
            })
        end,
    },
})

Description

I have mapping for left bracket to insert right bracket. If i press '(' in completion and then i hit ESC to cancel right bracket insertion, cmp inserts characters on wrong places. output

Steps to reproduce

open init.lua
write something
select completion with ctrl+n
hit '(' and ESC (fast)

Expected behavior

It should leave current selected completion.

Actual behavior

It inserts wrong text.

Additional context

Sometimes it leaves part of completion + '<Plug>(cmp.u.k.fallback_expr:)' in command line.

hrsh7th / nvim-cmp

Mapped confirm character breaks completion #1784

FAQ