fix duplicate tag issue #1326

autoload/vimwiki/tags.vim

@@ -123,15 +123,12 @@ function! s:scan_tags(lines, page_name) abort
 
     " Scan line for tags.  There can be many of them.
     let str = line
-    while 1
     " Get all matches
     let tag_groups = []
     call substitute(str, tag_search_rx, '\=add(tag_groups, submatch(0))', 'g')
     if tag_groups == []
-        break
+      continue
     endif
-      let tagend = matchend(str, tag_search_rx)
-      let str = str[(tagend):]
     for tag_group in tag_groups
       for tag in split(tag_group, tag_format.sep)
         " Create metadata entry
@@ -154,7 +151,6 @@ function! s:scan_tags(lines, page_name) abort
         call add(entries, entry)
       endfor
     endfor
-    endwhile
 
   endfor " loop over lines
   return entries