quickui#tools#preview_tag bug, may be related with Alt -> meta map

[leoatchina]

I have mapped alt -> meta key according to your article, and this bug only happend when I use vim, not neovim For example , I use <M-/> to previvew tags :nnoremap <silent> <M-/> :call quickui#tools#preview_tag('')<Cr>. If where is only one tag , and I press <M-/> two times, the first press works good, the second invoke /. As the same , <M-?> inoke ?, but <C-j>, <C-m>, <C-g> ....., etc have no bugs