Fix "No matching autocommands" error

[mityu]

This PR suppresses "No matching autocommands" message on opening/closing filter window like this.

No matching autocommands: User Ddu:ui:ff:openFilterWindow
No matching autocommands: User Ddu:ui:ff:closeFilterWindow

How to reproduce

1. vimrc.vim

set nocompatible

set runtimepath^=~/.cache/vim/pack/minpac/opt/denops.vim
set runtimepath^=~/.cache/vim/pack/minpac/opt/ddu.vim
set runtimepath^=~/.cache/vim/pack/minpac/opt/ddu-ui-ff

call ddu#custom#patch_global(#{ ui: 'ff' })

autocmd FileType ddu-ff nnoremap i <Cmd>call ddu#ui#do_action('openFilterWindow')<CR>
autocmd FileType ddu-ff nnoremap q <Cmd>call ddu#ui#do_action('quit')<CR>

nnoremap @ <Cmd>call ddu#start()<CR>

2. Open Vim with vim -u /path/to/vimrc.vim
3. Type @ to start ddu.
4. Type i<CR> to open and close filter window.
5. Check messages by :mes

Environment

• macOS Sonoma
• Vim 9.1.429
• deno 1.43.5
• ddu.vim 8fadcc364c039997b997a7485155944251315c9c
• ddu-ui-ff 1cb70c13bc80753184c08b3954fd2e532f0ff0a9

[mityu]

Hmm..., this PR likely reverts this fix: https://github.com/Shougo/ddu-ui-ff/commit/292d97640333d3508ad3377c890ae0ea8227a0e9

Does this PR give some other problems...?

[Shougo]

Merged.

[Shougo]

Does this PR give some other problems...?

I don't know...

[mityu]

Does this PR give some other problems...?

I don't know...

OK, thank you.