CodeMirror in IPython

We carry a mostly unmodified copy of CodeMirror. The current version we use is (please update this information when updating versions):

CodeMirror 2.15

The only changes we've applied so far are these:

diff --git a/IPython/frontend/html/notebook/static/codemirror/mode/python/python.js b/IPython/frontend/html/notebook/static/codemirror/mode/python/python.js
index ca94e7a..fc9a503 100644
--- a/IPython/frontend/html/notebook/static/codemirror/mode/python/python.js
+++ b/IPython/frontend/html/notebook/static/codemirror/mode/python/python.js
@@ -5,7 +5,11 @@ CodeMirror.defineMode("python", function(conf, parserConf) {
         return new RegExp("^((" + words.join(")|(") + "))\\b");
     }

-    var singleOperators = new RegExp("^[\\+\\-\\*/%&|\\^~<>!]");
+    // IPython-specific changes: add '?' as recognized character.
+    //var singleOperators = new RegExp("^[\\+\\-\\*/%&|\\^~<>!]");
+    var singleOperators = new RegExp("^[\\+\\-\\*/%&|\\^~<>!\\?]");
+    // End IPython changes.
+
     var singleDelimiters = new RegExp('^[\\(\\)\\[\\]\\{\\}@,:`=;\\.]');
     var doubleOperators = new RegExp("^((==)|(!=)|(<=)|(>=)|(<>)|(<<)|(>>)|(//)|(\\*\\*))");
     var doubleDelimiters = new RegExp("^((\\+=)|(\\-=)|(\\*=)|(%=)|(/=)|(&=)|(\\|=)|(\\^=))");

In practice it's just a one-line change, adding \? to singleOperators, surrounded by a comment. We'll turn this into a proper patchset if it ever gets more complicated than this, but for now this note should be enough.