code completion breaks when anyOf defines `required` properties.

#204 describes an issue with anyOf (and oneOf) error messaging. However, one way to solve this is to provide a schema-specific error message using the custom JSON property errorMessage as illustrated in this example.

However, the use of the required property (or the dependencies property) on anyOf subschemas will prevent monaco from surfacing it as a valid suggestion. In my example above, p1.shape can be fulfilled by both rectangle and square. However, the only autocomplete option that gets offered is rectangle

The reason this occurs is because the square subschema defines a required field side that is only available within that schema. It essentially ends up making square a hidden option for p1.shape critically breaking the expected completion.

PS: If side were to be removed from the required array in L62 of the example, completions start working as expected.

Start by reproducing the linked Monaco examples and inspecting the completion handling for anyOf subschemas with required or dependencies. Done means autocomplete offers both rectangle and square for p1.shape while preserving the expected behavior when side is required.