Don't leave iskeyword mutated in original buffer

Author: ches

plugin/vim-erlang-tags.vim

@@ -55,8 +55,10 @@ command! ErlangTags call VimErlangTags()
 function! s:GoToErlangTag(cmd)
     let orig_isk = &isk
     set isk+=:,#,?
-    execute a:cmd expand('<cword>')
+    let ident = expand('<cword>')
     let &isk = orig_isk
+
+    execute a:cmd ident
 endfunction
 
 function! VimErlangTagsDefineMappings()