Use <C-X><C-O><C-P> instead of <C-X><C-O>

[hayatogh]

Currently, ALE needs completeopt+=noselect,noinsert in users' .vimrc.

If completeopt is default value, first completion is selected. Type <C-P><C-N> to insert first one.
If completeopt is dafault value and omnifunc=ale#completion#OmniFunc, first completion is selected and inserted.

I want to select and insert first completion with <C-P>, <C-X><C-L> and <C-X><C-O> when I manually typed.
And I don't want to select first completion provided by ALE.

inoremap <silent> <Plug>(ale_show_completion_menu) <C-x><C-o><C-p>

solves this problem and looks like it has no degradation whatever completeopt is.

I've tested with this minimal .vimrc. with installed only latest ALE in .vim

filetype plugin indent on
syntax enable
set completeopt=menu,preview
" set completeopt=menu,menuone,preview,noselect,noinsert
let g:ale_linters = {'python': ['pyls']}
let g:ale_completion_enabled = 1
" set omnifunc=ale#completion#OmniFunc

and typed vim test.py

x = "foo"
x.

[w0rp]

This is genius. 😄 I have done this now.

[hayatogh]

Thank you for implementing and this great plugin!