fix: resolved model data invalidation (via #4858)

src/core/components/models.jsx

@@ -59,7 +59,7 @@ export default class Models extends Component {
             const rawSchema = specSelectors.specJson().getIn(fullPath, Im.Map())
             const displayName = schema.get("title") || rawSchema.get("title") || name
 
-            if(layoutSelectors.isShown(["models", name], false) && schema === undefined) {
+            if(layoutSelectors.isShown(["models", name], false) && (schema.size === 0 && rawSchema.size > 0)) {
               // Firing an action in a container render is not great,
               // but it works for now.
               this.props.specActions.requestResolvedSubtree([...this.getSchemaBasePath(), name])

test/e2e-cypress/static/documents/bugs/editor-1868.yaml

+swagger: "2.0"
+
+paths:
+  /:
+    get:
+      description: wow
+
+definitions:
+  MyModel:
+    type: object
+    properties:
+      a: 
+        type: string
\ No newline at end of file

test/e2e-cypress/tests/bugs/editor-1868.js

+import repeat from "lodash/repeat"
+
+describe("Editor #1868: model changes break rendering", () => {
+  it("should render model content changes correctly", () => {
+    cy
+      .visit("/?url=/documents/bugs/editor-1868.yaml")
+
+      .get(".model-toggle.collapsed")
+      .click()
+
+      .get("#model-MyModel")
+      .contains("a")
+
+      .window()
+      .then(win => {
+        // Simulate Swagger Editor updating a model
+        const content = win.ui.specSelectors.specStr()
+        win.ui.specActions.updateSpec(content + `\n      b:\n        type: string`)
+      })
+
+      .get("#model-MyModel")
+      .contains("a")
+      .get("#model-MyModel")
+      .contains("b")
+  })
+})
\ No newline at end of file