JSON Schema “oneOf”: autocompletion of property name doesn’t insert a colon

[LehmannSa]

monaco-editor version: 0.21.2
Browser: Any
OS: Windows 10

Steps reproducing the issue:

Run the following snippet within the Monaco Editor Playground:

var jsonCode = [
    '{','}'
].join('\n');
var modelUri = monaco.Uri.parse("a://b/foo.json"); // a made up unique URI for our model
var model = monaco.editor.createModel(jsonCode, "json", modelUri);

// configure the JSON language support with schemas and schema associations
monaco.languages.json.jsonDefaults.setDiagnosticsOptions({
    validate: true,
    schemas: [{
        uri: "http://myserver/foo-schema.json", // id of the first schema
        fileMatch: [modelUri.toString()], // associate with our model
        schema: {
            type: "object",
            properties: {
                enum : { enum: ["a","b"]},
                object : {
                            type: "object",
                            properties : {
                                q: {
                                    enum: ["c","d"]
                                }
                            }
                        },
                oneOf: {
                    oneOf: [
                        { enum: ["a","b"]},
                        {
                            type: "object",
                            properties : {
                                q: {
                                    enum: ["c","d"]
                                }
                            }
                        }
                    ] 
                }
            }
        }
    }
    ]
});

monaco.editor.create(document.getElementById("container"), {
    model: model
});

Typing "estrg+space tab between the curly brackets leads to:
"enum":

Typing "obstrg+space tab between the curly brackets leads to:
"object":{}

Whereas typing "onstrg+space tab between the curly brackets leads to:
"oneOf"
instead of:
"oneOf":