IE11 - js Error when editing empty strings

[kimmings]

When attempting to edit empty strings in IE11 - either if the value prop is initially set to "" or if the content is deleted, then the user attempts to enter new values - we get the error:
"Object doesn't support property or method 'contains'"

stack:
"TypeError: Object doesn't support property or method 'contains'\n at r.prototype.placeMarkers (eval code:5:22062)\n at p.prototype.pushHistory (eval code:6:11603)\n at end (eval code:6:14049)\n at run (eval code:6:14200)\n at Anonymous function (eval code:5:31091)\n at Anonymous function (eval code:5:25519)"