fix(oas3): attempt to render schemas not resolved by swagger-client (#9629)

Refs #9513

test/e2e-cypress/e2e/features/plugins/oas3/complex-spec.cy.js

@@ -0,0 +1,37 @@
+/**
+ * @prettier
+ */
+
+describe("OpenAPI 3.0 complex spec with allOf and nested references", () => {
+  it("should render nested references", () => {
+    cy.visit("/?url=/documents/features/oas3-complex-spec.json").then(() => {
+      cy.get(
+        "[id='model-com.sap.ctsm.backend.core.api.study.v1.StudyAPIv1.StudyTreatments-create']"
+      )
+        .find("button")
+        .click()
+      cy.get(".property-row")
+        .contains("scenario")
+        .siblings()
+        .as("scenarioSiblings")
+      cy.get("@scenarioSiblings").find("button").click()
+      cy.get("@scenarioSiblings")
+        .find("span")
+        .contains("scenarioID")
+        .should("not.exist")
+      cy.get("@scenarioSiblings")
+        .find("span")
+        .contains("Scenarios (for create)")
+        .should("exist")
+        .click()
+      cy.get("@scenarioSiblings")
+        .find("span")
+        .contains("scenarioID")
+        .should("exist")
+      cy.get("@scenarioSiblings")
+        .find("span")
+        .contains("#/components/schemas/unresolvedRef")
+        .should("exist")
+    })
+  })
+})