With narrow screen, completion list of methods overlaps the documentation window

[baco]

When the space at either side of the completion list is too narrow, the documentation floating-window gets behind completion list, having part of the text impossible to read.

My testing minimal init.vim

" nvim-lspconfig
lua require('lspconfig').pyls.setup{}

" completion-nvim
autocmd FileType python lua require('completion').on_attach()
let g:completion_matching_strategy_list = ['exact', 'substring', 'fuzzy']
let g:completion_matching_ignore_case = 1  " not v:true, 1. ¯\_(ツ)_/¯
let g:completion_matching_smart_case = 1  " not v:true, 1. ¯\_(ツ)_/¯
let g:completion_trigger_on_delete = 1  " not v:true, 1. ¯\_(ツ)_/¯

How to reproduce

• Have launched vim in a 80 column terminal
• Intent a line as if you needed to write your first character around column 40 (half of the width of the terminal)
• Start typing and select some of the completions
• Sometimes the documentation window gets underneath the completion list like this:

Expected behavior
Not having documentation underneath the list of completions because it makes it impossible to read.