Override regex for html inline pattern when smart_angled_quotes is true

Add a restriction that the closing angled quote should not be duplicate,
so that we can use our own pattern for handling duplicate quotes.

markdown/extensions/smarty.py

@@ -83,7 +83,7 @@
 
 from __future__ import unicode_literals
 from . import Extension
-from ..inlinepatterns import HtmlPattern
+from ..inlinepatterns import HtmlPattern, HTML_RE
 from ..odict import OrderedDict
 from ..treeprocessors import InlineProcessor
 
@@ -147,6 +147,8 @@
 remainingSingleQuotesRegex = "'"
 remainingDoubleQuotesRegex = '"'
 
+HTML_STRICT_RE = HTML_RE + r'(?!\>)'
+
 
 class SubstituteTextPattern(HtmlPattern):
     def __init__(self, pattern, replace, markdown_instance):
@@ -251,6 +253,9 @@ def extendMarkdown(self, md, md_globals):
             self.educateQuotes(md)
         if configs['smart_angled_quotes']:
             self.educateAngledQuotes(md)
+            # Override HTML_RE from inlinepatterns.py so that it does not
+            # process tags with duplicate closing quotes.
+            md.inlinePatterns["html"] = HtmlPattern(HTML_STRICT_RE, md)
         if configs['smart_dashes']:
             self.educateDashes(md)
         inlineProcessor = InlineProcessor(md)