NeoVim man pager cannot handle colours correctly after enabling vim-polyglot

[Frederick888]

Does this bug happen when you install plugin without vim-polyglot?
No.

Describe the bug:
With vim-polyglot enabled, nvim manpager cannot handle colours correctly. See screenshot:

And nvim warns that file's been modified when :q.

If I open nvim first then :Man man, the colours are ok but it somehow still modifies the [No Name] buffer and I can see a warning when :qa.

To Reproduce:

1. Using NeoVim v0.4.4, macOS or Linux
2. export MANPAGER='nvim +Man!'
3. Use the init.vim below
4. man man

set runtimepath^=~/.vim runtimepath+=~/.vim/after
let &packpath = &runtimepath

call plug#begin()
Plug 'sheerun/vim-polyglot'
call plug#end()

[sheerun]

I can't reproduce colors issue, but I can reproduce warning when trying to exit

[Frederick888]

@sheerun After updating vim-polyglot both my issues were fixed. Thank you!

[vokar]

@sheerun, I just pulled the last changes and now have the same problem. Looking through the commit history, I found that you returned the man plugin in af3ebda, so that's the reason.

I have NVIM v0.4.4 too.

[sheerun]

Man, I was supposed to add only filetypes detection, thank you!

[vokar]

No problem. Thank you for the quick reaction and for adding a regression test 😄