back out r12680

<pre>
  1) Failure:
test_children(ProjectTest) [test/unit/project_test.rb:374]:
<[5, 3, 4]> expected but was
<[3, 4, 5]>.
</pre>

git-svn-id: http://svn.redmine.org/redmine/trunk@12681 e93f8b46-1217-0410-a6f0-8f06a7374b81