Make <SID>foldopen buffer local

References vim-ruby#214.

Author: tpope

ftplugin/ruby.vim

@@ -190,7 +190,7 @@ if !exists("g:no_plugin_maps") && !exists("g:no_ruby_maps")
   endif
 
   if maparg("\<C-]>",'n') == ''
-    cnoremap <SID>foldopen <Bar>if &foldopen =~# 'tag'<Bar>exe 'norm! zv'<Bar>endif
+    cnoremap <buffer> <SID>foldopen <Bar>if &foldopen =~# 'tag'<Bar>exe 'norm! zv'<Bar>endif
     nnoremap <silent> <script> <buffer> <C-]>       :<C-U>exe  v:count1."tag <C-R>=RubyCursorIdentifier()<CR>"<SID>foldopen<CR>
     nnoremap <silent> <script> <buffer> g<C-]>      :<C-U>exe         "tjump <C-R>=RubyCursorIdentifier()<CR>"<SID>foldopen<CR>
     nnoremap <silent> <script> <buffer> g]          :<C-U>exe       "tselect <C-R>=RubyCursorIdentifier()<CR>"<SID>foldopen<CR>