Add validation for maximum ID passed to changesets#index

test/controllers/changesets_controller_test.rb

@@ -92,6 +92,15 @@ class ChangesetsControllerTest < ActionDispatch::IntegrationTest
     check_index_result(changesets.last(20))
   end
 
+  ##
+  # This should report an error
+  def test_index_invalid_xhr
+    %w[-1 0 fred].each do |id|
+      get history_path(:format => "html", :list => "1", :max_id => id)
+      assert_redirected_to :controller => :errors, :action => :bad_request
+    end
+  end
+
   ##
   # This should display the last 20 changesets closed in a specific area
   def test_index_bbox