exec "normal! \<Tab>" がうまく実行できなかったため、その対応

pluse_jump.vim

nnoremap <Plug>MyplusejumpTab <C-i>

function! s:jump(cmd) abort
  let l:bufname = bufname('%')
  if a:cmd ==# 'next'
    " exec "normal! \<Tab>"
    exec "normal <Plug>MyplusejumpTab"
  else
    exec "normal! \<C-o>"
  endif

  let l:new_bufname = bufname('%')
  if l:bufname !=# l:new_bufname
    call search_pulse#Pulse(v:true)
  endif
endfunction

nnoremap <silent> <C-o> <Cmd>call <SID>jump('prev')<CR>
nnoremap <silent> <Tab> <Cmd>call <SID>jump("next")<CR>