Use ids for testing inclusion.

git-svn-id: http://svn.redmine.org/redmine/trunk@16260 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/users/_groups.html.erb

@@ -1,8 +1,9 @@
 <%= form_for(:user, :url => { :action => 'update' }, :html => {:method => :put}) do %>
 <div class="box">
 <div id="user_group_ids">
+<% user_group_ids = @user.group_ids %>
 <% Group.givable.sort.each do |group| %>
-<label><%= check_box_tag 'user[group_ids][]', group.id, @user.groups.to_a.include?(group), :id => nil %> <%= group %></label><br />
+<label><%= check_box_tag 'user[group_ids][]', group.id, user_group_ids.include?(group.id), :id => nil %> <%= group %></label><br />
 <% end %>
 <%= hidden_field_tag 'user[group_ids][]', '' %>
 </div>