statusline briefly flashes in front of cmdline when cmdheight=0 and using nvim-cmp

FAQ

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Announcement

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Minimal reproducible full config

if has('vim_starting')
  set encoding=utf-8
endif
scriptencoding utf-8

if &compatible
  set nocompatible
endif

set cmdheight=0
set laststatus=2

let s:plug_dir = expand('/tmp/plugged/vim-plug')
if !filereadable(s:plug_dir .. '/plug.vim')
  execute printf('!curl -fLo %s/autoload/plug.vim --create-dirs https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim', s:plug_dir)
end

execute 'set runtimepath+=' . s:plug_dir
call plug#begin(s:plug_dir)
Plug 'hrsh7th/nvim-cmp'
Plug 'hrsh7th/cmp-nvim-lsp'
Plug 'hrsh7th/cmp-buffer'
Plug 'hrsh7th/cmp-cmdline'
Plug 'hrsh7th/cmp-path'
Plug 'hrsh7th/vim-vsnip'
Plug 'neovim/nvim-lspconfig'
call plug#end()
PlugInstall | quit

" Setup global configuration. More on configuration below.
lua << EOF

local has_words_before = function()
    local line, col = unpack(vim.api.nvim_win_get_cursor(0))
    return col ~= 0 and vim.api.nvim_buf_get_lines(0, line - 1, line, true)[1]:sub(col, col):match('%s') == nil
end

local feedkey = function(key, mode)
    vim.api.nvim_feedkeys(vim.api.nvim_replace_termcodes(key, true, true, true), mode, true)
end

local cmp = require('cmp')

cmp.setup({

    formatting = {
        fields = { 'abbr', 'kind' }
    },

    snippet = {
        expand = function(args)
            vim.fn['vsnip#anonymous'](args.body)
        end,
    },

    window = {
        completion = {
            border = { '╭', '─', '╮', '│', '╯', '─', '╰', '│' },
            winhighlight = 'Normal:CmpItemMenu,FloatBorder:CmpItemMenuBorder,CursorLine:CmpItemMenuSel,Search:CmpItemMenuSearch'
        }
    },

    mapping = cmp.mapping.preset.insert({

        ['<C-b>'] = cmp.mapping.scroll_docs(-4),
        ['<C-f>'] = cmp.mapping.scroll_docs(4),
        ['<C-Space>'] = cmp.mapping.complete(),
        ['<C-e>'] = cmp.mapping.abort(),
        ['<CR>'] = cmp.mapping.confirm({ select = true }),

        ['<Tab>'] = cmp.mapping(function(fallback)
            if cmp.visible() then
                cmp.select_next_item()
            elseif vim.fn['vsnip#available'](1) == 1 then
                feedkey('<Plug>(vsnip-expand-or-jump)', '')
            elseif has_words_before() then
                cmp.complete()
            else
                fallback()
            end
        end, { 'i', 's' }),

        ['<S-Tab>'] = cmp.mapping(function()
            if cmp.visible() then
                cmp.select_prev_item()
            elseif vim.fn['vsnip#jumpable'](-1) == 1 then
                feedkey('<Plug>(vsnip-jump-prev)', '')
            end
        end, { 'i', 's' }),

    }),

    sources = cmp.config.sources({
        { name = 'nvim_lsp' },
            { name = 'vsnip' },
        },
        {
            { name = 'buffer' },
        })
    })

    cmp.setup.cmdline('/', {
        mapping = cmp.mapping.preset.cmdline(),
        sources = {
            { name = 'buffer' }
        }
    })

    cmp.setup.cmdline(':', {
        mapping = cmp.mapping.preset.cmdline(),
        sources = cmp.config.sources({
            { name = 'path' }
        },
        {
            { name = 'cmdline' }
        })
    })
EOF

lua << EOF
local capabilities = require('cmp_nvim_lsp').update_capabilities(vim.lsp.protocol.make_client_capabilities())

require'lspconfig'.cssls.setup {
  capabilities = capabilities,
}
EOF

Description

When using cmdheight=0 and laststatus=2 the statusline will flash briefly in front of the cmdline when the completion menu is open.

Steps to reproduce

Type something into the cmdline that will pop a completion window up and you will notice sometimes how the statusline flashes. This does not happen all of the time but it certainly does happen most of the time.

This does not happen when running nvim --clean

Expected behavior

The statusline should not flash in front of the cmdline.

Actual behavior

The statusline flashes briefly in front of the cmdline when the completion menu is open.

https://user-images.githubusercontent.com/14960414/194352658-742e069a-91df-4fed-82f5-ff5b63c4128e.mp4

https://user-images.githubusercontent.com/14960414/194352734-9af4990a-2e8c-4d95-997f-7a73f2c7772d.mp4

Additional context

No response

hrsh7th / nvim-cmp