Fern's default render does not highlight folder correctly when setting `g:fern#renderer#default#leading` with consecutive spaces

[phongnh]

• vimrc to reproduce issue

" ~/.vimrc

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

" No Vi Compatibility
if &compatible
    set nocompatible
endif

if &shell =~# 'fish$' " && (v:version < 704 || v:version == 704 && !has('patch276'))
    if executable('zsh')
        let &shell = exepath('zsh')
    elseif executable('bash')
        let &shell = exepath('bash')
    endif
endif

" Python 3
if executable('python3')
    let g:python3_host_prog = exepath('python3')
endif

if has('pythonx')
    set pyxversion=3
endif

call plug#begin()

Plug 'lambdalisue/fern.vim'

call plug#end()

let g:fern#renderer#default#root_symbol      = "\u2302\u00a0"
let g:fern#renderer#default#leading          = '  '
let g:fern#renderer#default#leaf_symbol      = '  '
let g:fern#renderer#default#collapsed_symbol = '+ '
let g:fern#renderer#default#expanded_symbol  = '~ '

function! s:InitFern() abort
    nmap <buffer> <Plug>(fern-action-reload-and-redraw)
                \ <Plug>(fern-action-reload)
                \ <Plug>(fern-action-redraw)

    nmap     <buffer> <silent> o  <Plug>(fern-action-open-or-expand)
    nmap     <buffer> <silent> p  <Plug>(fern-action-leave)
    nmap     <buffer> <silent> u  <Plug>(fern-action-leave)
    nmap     <buffer> <silent> r  <Plug>(fern-action-reload-and-redraw)
    nmap     <buffer> <silent> I  <Plug>(fern-action-hidden-toggle)
    nmap     <buffer> <silent> cd <Plug>(fern-action-cd)
    nnoremap <buffer> <silent> q  :<C-u>quit<CR>
endfunction

augroup MyAutoCmd
    autocmd!
    autocmd FileType fern call <SID>InitFern()
augroup END

• Open Fern .

• Screenshots

• When I set g:fern#renderer#default#leading and g:fern#renderer#default#leaf_symbol to one space, Fern highlights folder correctly

Could you please check it? Thanks.

[phongnh]

I figured out that default renderer will render node with one starting space.

Tried to update regex with one more \s to FernRootSymbol, FernLeafSymbol and FernBranchSymbol. It seems that that will fix the problem.

[lambdalisue]

I'm sorry I didn't notice this. Well, I don't get the situation so could you create a minimal vimrc and step by step to reproduce the issue first? (note that what you wrote in PR description is not minimal)

[phongnh]

Here is my min vimrc

set encoding=utf-8
scriptencoding utf-8
set nocompatible
set termguicolors
set runtimepath^=~/.vim/plugged/fern.vim

let g:fern#renderer#default#root_symbol      = "\u2302\u00a0"
let g:fern#renderer#default#leading          = '  '
let g:fern#renderer#default#leaf_symbol      = '  '
let g:fern#renderer#default#collapsed_symbol = '+ '
let g:fern#renderer#default#expanded_symbol  = '~ '

syntax on
filetype plugin indent on

Reproduce issue: https://asciinema.org/a/UdlXe3sT2cqc2UhOhBQtL2u3T

With code from my fork: https://asciinema.org/a/OqYltWUh5eP7DUH0OuGapG0KG

Please check, thanks.

[lambdalisue]

Thanks. Now I got the situation.

I've create a new PR based on your fix. Please test it https://github.com/lambdalisue/fern.vim/pull/274