backport PR #2631 to take into account additionalProperties set to false in schema

# Conflicts:
#	packages/utils/src/schema/toPathSchema.ts
#	packages/utils/test/schema/toPathSchemaTest.ts

Author: Lausselloic

CHANGELOG.md

@@ -16,6 +16,8 @@ should change the heading of the (upcoming) version to include a major version b
 
 -->
 # v5.0.0 (coming soon)
+## @rjsf/utils
+- clear errors on formData change when liveOmit=true when "additionalProperties: false" [issue 1507](https://github.com/rjsf-team/react-jsonschema-form/issues/1507) (https://github.com/rjsf-team/react-jsonschema-form/pull/2631)
 
 # 4.2.1 (upcoming)
 

packages/utils/src/schema/toPathSchema.ts

@@ -37,8 +37,9 @@ export default function toPathSchema<T = any>(
     $name: name.replace(/^\./, ""),
   } as PathSchema;
 
-  if (ADDITIONAL_PROPERTIES_KEY in schema) {
-    set(pathSchema, "__rjsf_additionalProperties", true);
+  if (ADDITIONAL_PROPERTIES_KEY in schema && 
+    schema[ADDITIONAL_PROPERTIES_KEY] !== false) {
+    set(pathSchema, '__rjsf_additionalProperties', true);
   }
 
   if (ITEMS_KEY in schema && Array.isArray(formData)) {

packages/utils/test/schema/toPathSchemaTest.ts

@@ -15,8 +15,12 @@ export default function toPathSchemaTest(testValidator: TestValidatorType) {
         $name: "",
         __rjsf_additionalProperties: true,
       });
+    it('should return a pathSchema for root field, without additional properties', () => {
+      const schema: RJSFSchema = { type: 'string', additionalProperties: false };
+
+      expect(toPathSchema(testValidator, schema)).toEqual({ $name: ''});
     });
-    it("should return a pathSchema for nested objects", () => {
+    it('should return a pathSchema for nested objects', () => {
       const schema: RJSFSchema = {
         type: "object",
         properties: {