function! s:NM_add_remove_tags(filter, prefix, tags)
let filter = len(a:filter) ? a:filter : [<SID>NM_search_thread_id()]
if !len(filter)
function! s:NM_add_remove_tags(filter, prefix, tags)
let filter = len(a:filter) ? a:filter : [<SID>NM_search_thread_id()]
if !len(filter)