Pre Chunk-Handler gets confused when XML parser converts empty elements to short-tag syntax.

Reported by Andrew Stacey.

lib/chunks/literal.rb

@@ -18,7 +18,7 @@ module Literal
   # A literal chunk that protects 'code' and 'pre' tags from wiki rendering.
   class Pre < AbstractLiteral
     PRE_BLOCKS = "a|pre|code|math"
-    PRE_PATTERN = Regexp.new('<('+PRE_BLOCKS+')\b[^>]*?>.*?</\1>', Regexp::MULTILINE)
+    PRE_PATTERN = Regexp.new('<('+PRE_BLOCKS+')\b[^>]*?(>.*?</\1>|/>)', Regexp::MULTILINE)
     def self.pattern() PRE_PATTERN end
   end 
 

test/unit/chunks/nowiki_test.rb

@@ -56,4 +56,16 @@ class NoWikiTest < Test::Unit::TestCase
     )
   end
 
+  def test_sanitize_empty_nowiki
+    match(NoWiki, "<nowiki></nowiki>",
+                :plain_text => ''
+    )
+  end
+
+  def test_sanitize_blank_nowiki
+    match(NoWiki, "<nowiki>\n</nowiki>",
+                :plain_text => "\n"
+    )
+  end
+
 end

test/unit/page_renderer_test.rb

@@ -44,6 +44,12 @@ class PageRendererTest < ActiveSupport::TestCase
     assert_equal %w( HisWay SmartEngineGUI ), x_test_renderer(@revision).unexisting_pages.sort
   end
 
+  def test_wiki_links_after_empty
+    assert_markup_parsed_as(%{<code/>\n<p>This is a <span class='newWikiWord'>wikilink<a href=} +
+      %{'../show/wikilink'>?</a></span>.</p>},
+      "<code></code>\n\nThis is a [[wikilink]].")
+  end
+
   def test_content_with_wiki_links
     assert_equal "<p><span class='newWikiWord'>His Way<a href='../show/HisWay'>?</a></span> " +
         "would be <a class='existingWikiWord' href='../show/MyWay'>My Way</a> " +