Fix webelem.javascript_escape with U+2028/U+2029.

qutebrowser/browser/webelem.py

@@ -308,6 +308,9 @@ def javascript_escape(text):
         ('\n', r'\n'),  # We also need to escape newlines for some reason.
         ('\r', r'\r'),
         ('\x00', r'\x00'),
+        # http://stackoverflow.com/questions/2965293/
+        ('\u2028', r'\u2028'),
+        ('\u2029', r'\u2029'),
     )
     for orig, repl in replacements:
         text = text.replace(orig, repl)

tests/unit/browser/test_webelem.py

@@ -587,6 +587,9 @@ class TestJavascriptEscape:
         '☃': '☃',
         '\x80Ā': '\x80Ā',
         '𐀀\x00𐀀\x00': r'𐀀\x00𐀀\x00',
+        # http://stackoverflow.com/questions/2965293/
+        '\u2028': r'\u2028',
+        '\u2029': r'\u2029',
     }
 
     # Once there was this warning here: