Test for handler functions not interfering with CSS id queries

test/files/tlm.html

@@ -827,6 +827,7 @@ <h3>Step 3: Upload the video file</h3>
 </div>
 
 <div id="abc.123" class='special.character'>Special character div</div>
+<div id="partial_collision_id">Partial collision id</div>
 <div id="footer">
 A design by <a href="http://blog.geminigeek.com/wordpress-theme">GeminiGeek</a> &bull; Powered by <a href="http://wordpress.org">Wordpress</a><!--&bull; <a href="#">CSS</a> &bull; <a href="#">xHTML 1.0</a>-->
 </div>

test/html/test_document.rb

@@ -496,6 +496,15 @@ def awesome divs
         }.new)
       end
 
+      def test_find_with_partial_id_collision_function
+        found_by_id = @html.css("#partial_collision_id", Class.new {
+          def collision nodes
+            [nodes.first]
+          end
+        }.new)
+        assert_equal 1, found_by_id.length
+      end
+
       def test_dup_shallow
         found = @html.search('//div/a').first
         dup = found.dup(0)