Added test for changeset/download hiding redacted elements

app/controllers/changeset_controller.rb

@@ -143,10 +143,11 @@ class ChangesetController < ApplicationController
   def download
     changeset = Changeset.find(params[:id])
     
-    # get all the elements in the changeset and stick them in a big array.
-    elements = [changeset.old_nodes, 
-                changeset.old_ways, 
-                changeset.old_relations].flatten
+    # get all the elements in the changeset which haven't been redacted
+    # and stick them in a big array.
+    elements = [changeset.old_nodes.unredacted, 
+                changeset.old_ways.unredacted, 
+                changeset.old_relations.unredacted].flatten
     
     # sort the elements by timestamp and version number, as this is the 
     # almost sensible ordering available. this would be much nicer if 

test/functional/changeset_controller_test.rb

@@ -1747,6 +1747,22 @@ EOF
     assert_template 'user/no_such_user'
   end
   
+  ##
+  # check that the changeset download for a changeset with a redacted
+  # element in it doesn't contain that element.
+  def test_diff_download_redacted
+    changeset_id = changesets(:public_user_first_change).id
+
+    get :download, :id => changeset_id
+    assert_response :success
+
+    assert_select "osmChange", 1
+    # this changeset contains node 17 in versions 1 & 2, but 1 should
+    # be hidden.
+    assert_select "osmChange node[id=17]", 1
+    assert_select "osmChange node[id=17][version=1]", 0
+  end
+
   #------------------------------------------------------------
   # utility functions
   #------------------------------------------------------------