Inconsistent behavior for ui:widget hidden in different themes

[01jaraujo]

Prerequisites

• I have read the documentation;
• In the case of a bug report, I understand that providing a SSCCE example is tremendously useful to the maintainers.
• Ideally, I'm providing a sample JSFiddle or a shared playground link demonstrating the issue.

Description

I'm trying to hide an Object property and understand this feature is not supported per the docs:
Hiding widgets is only supported for boolean, string, number and integer schema types

But in the live playground I'm able to successfully hide the Object property which is what I need, this is feature intended? If not, I think it should be offered to easily hide data types other than boolean, string, number and integer schema types. Here's a link to the playground.

The object property is hidden with the default theme:

The issue I'm running into is moving to material-ui as the theme does not hide the Object property. I think not only should we be able to hide Object properties but that it should be consistent across all themes. Currently the default theme, antd, fluent-ui and bootstrap-4 support hiding the Object property but not with material-ui or sematic-ui.

The object property is not hidden:

Is there any workaround available to achieve this behaviour?

Expected behavior

I expected to not be able to hide the Object property but does work but only in certain themes.

Actual behavior

The Object property is hidden in the live playground:

Here's the JSONSchema and UISchema I used in the playground:

• JSONSchema
  { "title": "Test Form", "type": "object", "properties": { "prop1": { "$ref": "#/definitions/TestFormProp1" }, "prop2": { "$ref": "#/definitions/TestFormProp2" } }, "required": [ "prop1", "prop2" ], "definitions": { "TestFormProp1": { "title": "Prop 1", "type": "object", "properties": { "field1": { "title": "Field1", "type": "integer" }, "field2": { "title": "Field2", "type": "integer" } }, "required": [ "field1", "field2" ] }, "TestFormProp2": { "title": "Prop 2", "type": "object", "properties": { "field3": { "title": "Field3", "type": "integer" }, "field4": { "title": "Field4", "type": "integer" } }, "required": [ "field3", "field4" ] } } }
• UISchema
  { "prop2": { "ui:widget": "hidden" } }

[heath-freenome]

Fixed in v5 beta via #3036