chore: Avoid Form retrieveSchema twice when liveValidate is true (#3959)

* Avoid retrieveSchema multiple times

* Fix changelog

CHANGELOG.md

@@ -27,6 +27,10 @@ should change the heading of the (upcoming) version to include a major version b
 
 - Update `sanitizeDataForNewSchema()` to avoid spreading strings and Arrays into the returned value when the old schema is of type `string` or `array` and the new schema is of type `object`. Fixing [#3922](https://github.com/rjsf-team/react-jsonschema-form/issues/3922)
 
+## @rjsf/core
+
+- avoid call `retrieveSchema` twice during `getStateFromProps` and `mustValidate` is true [#3959](https://github.com/rjsf-team/react-jsonschema-form/pull/3959)
+
 # 5.14.1
 
 ## @rjsf/utils

packages/core/src/components/Form.tsx

@@ -394,7 +394,7 @@ export default class Form<
     let schemaValidationErrors: RJSFValidationError[] = state.schemaValidationErrors;
     let schemaValidationErrorSchema: ErrorSchema<T> = state.schemaValidationErrorSchema;
     if (mustValidate) {
-      const schemaValidation = this.validate(formData, schema, schemaUtils);
+      const schemaValidation = this.validate(formData, schema, schemaUtils, retrievedSchema);
       errors = schemaValidation.errors;
       errorSchema = schemaValidation.errorSchema;
       schemaValidationErrors = errors;
@@ -451,11 +451,12 @@ export default class Form<
   validate(
     formData: T | undefined,
     schema = this.props.schema,
-    altSchemaUtils?: SchemaUtilsType<T, S, F>
+    altSchemaUtils?: SchemaUtilsType<T, S, F>,
+    retrievedSchema?: S
   ): ValidationData<T> {
     const schemaUtils = altSchemaUtils ? altSchemaUtils : this.state.schemaUtils;
     const { customValidate, transformErrors, uiSchema } = this.props;
-    const resolvedSchema = schemaUtils.retrieveSchema(schema, formData);
+    const resolvedSchema = retrievedSchema ?? schemaUtils.retrieveSchema(schema, formData);
     return schemaUtils
       .getValidator()
       .validateFormData(formData, resolvedSchema, customValidate, transformErrors, uiSchema);