Give the action the last tag standing in a multi-selection

Entries opened in the loop take the action only when one was selected, so
refusing the others left the survivor opened with ':edit' and the key ignored.

autoload/fzf/vim.vim

@@ -1849,6 +1849,11 @@ function! s:tags_sink(from, lines)
 
     call s:fill_quickfix('tags', qfl)
   elseif len(qfl) == 1
+    " Entries opened in the loop take the action only when one was selected, so
+    " the last one standing of a multi-selection still owes the key its action
+    if len(list) > 1
+      call s:action_for(key, qfl[0].filename, 1)
+    endif
     normal! ^zvzz
   endif
   if !empty(tagname)