Autocompletion: supporting self references

Hi,

Look like self references are not supported by the schema autocompletion feature. For example, on self key in the example below:

   {
        "type": "object",
        "properties": {
            "self": {
                "$ref": "#"
            },
            "bar": {
                "type": "string",
                "enum": [
                    "A",
                    "B"
                ]
            }
        },
        "additionalProperties": false
    }