[FIX] tools: html_keep_url

If an url is the label of a tag a, the htm_keep_url doesn't have
to treat this url.

opw:656821

openerp/tools/mail.py

@@ -466,7 +466,7 @@ def html_keep_url(text):
     """ Transform the url into clickable link with <a/> tag """
     idx = 0
     final = ''
-    link_tags = re.compile(r"""(?<!["'])((ftp|http|https):\/\/(\w+:{0,1}\w*@)?([^\s"':]+)(:[0-9]+)?(\/|\/([^\s"']))?)(?![^\s"']*["'])""")
+    link_tags = re.compile(r"""(?<!["'])((ftp|http|https):\/\/(\w+:{0,1}\w*@)?([^\s<"':]+)(:[0-9]+)?(\/|\/([^\s<"']))?)(?![^\s<"']*["']|[^\s<"']*</a>)""")
     for item in re.finditer(link_tags, text):
         final += text[idx:item.start()]
         final += '<a href="%s" target="_blank">%s</a>' % (item.group(0), item.group(0))