autoload/plugins/vim_airline.vim

Enforce vim script implementation to reduce ambiguities and improve robustness:

scriptversion 4

toggle_searchcount() → None

Use built-in search count display when ‘hlsearch’ is disabled.

function! plugins#vim_airline#toggle_searchcount() abort
    if &hlsearch
        set shortmess+=S
    else
        set shortmess-=S
    endif
endfunction