Prefix matcher for ddc.vim
It removes items does not match input prefix.
https://github.com/vim-denops/denops.vim
https://github.com/Shougo/ddc.vim
" Use both matcher_head and matcher_prefix.
call ddc#custom#patch_global('sourceOptions', #{
\ _: #{
\ matchers: ['matcher_head', 'matcher_prefix'],
\ })