Fix Maruku Footnote Backlink

Problem reported by Shamaoke.

test/unit/page_renderer_test.rb

@@ -216,6 +216,21 @@ END_THM
   
   end
 
+  def test_footnotes
+    assert_markup_parsed_as("<p>Ruby on Rails is a web-framework<sup id='fnref:1'><a href='#fn" +
+    ":1' rel='footnote'>1</a></sup>. It uses the MVC<sup id='fnref:2'><a href='#fn:2' rel='foo" +
+    "tnote'>2</a></sup> architecture pattern. It has its good points<sup id='fnref:3'><a href=" +
+    "'#fn:3' rel='footnote'>3</a></sup>.</p>\n<div class='footnotes'><hr/><ol><li id='fn:1'>\n" +
+    "<p>a reusable set of libraries <a href='#fnref:1' rev='footnote'>\342\206\251</a></p>\n</li><li" +
+    " id='fn:2'>\n<p>Model View Controller <a href='#fnref:2' rev='footnote'>\342\206\251</a></p>\n<" +
+    "/li><li id='fn:3'>\n<p>Here are its good points</p>\n\n<ol>\n<li>Ease of use</li>\n\n<li>" +
+    "Rapid development</li>\n</ol>\n<a href='#fnref:3' rev='footnote'>\342\206\251</a></li></ol></div>",
+    "Ruby on Rails is a web-framework[^framework]. It uses the MVC[^MVC] architecture pattern." +
+    " It has its good points[^points].\n\n[^framework]: a reusable set of libraries\n\n[^MVC]:" +
+    " Model View Controller\n\n[^points]: Here are its good points\n1. Ease of use\n2. Rapid d" +
+    "evelopment")
+  end
+
   def test_ial_in_lists
 
     assert_markup_parsed_as(

vendor/plugins/maruku/lib/maruku/output/to_html.rb

@@ -326,7 +326,21 @@ Example:
 						a.attributes['href'] = "\##{get_setting(:doc_prefix)}fnref:#{num}"
 						a.attributes['rev'] = 'footnote'
 						a<< Text.new('&#8617;', true, nil, true)
-					li.insert_after(li.children.last, a)
+
+					last = nil
+					li.children.reverse_each do |child|
+					  if child.node_type != :text
+					    last = child
+					    break
+					  end 
+					end
+
+					if last and last.name == "p"
+					  last.add_text(' ');
+					  last.add(a);
+					else
+					   li.insert_after(li.children.last, a)
+					end
 					ol << li
 				else
 					maruku_error "Could not find footnote id '#{fid}' among ["+