fix(xml): example generation if an array has an example (#6634)

ref: #6627

src/core/plugins/samples/fn.js

@@ -202,6 +202,10 @@ export const sampleFromSchemaGeneric = (schema, config={}, exampleOverride = und
         if (schema && props[propName] && props[propName].writeOnly && !includeWriteOnly) {
           continue
         }
+        if (schema && props[propName] && props[propName].xml && props[propName].xml.attribute && !(example && example[propName])) {
+          _attr[props[propName].xml.name || propName] = sample[propName]
+          continue
+        }
         if (schema && props[propName] && props[propName].xml && props[propName].xml.attribute) {
           _attr[props[propName].xml.name || propName] = example[propName]
           continue

test/e2e-cypress/static/documents/bugs/6627.yaml

+openapi: 3.0.1
+info:
+  title: XML array schema with array-level example
+  version: 1.0.0
+
+paths:
+  /users:
+    get:
+      responses:
+        "200":
+          description: ''
+          content:
+            application/xml:
+              schema:
+                $ref: '#/components/schemas/Users'
+
+components:
+  schemas:
+    Users:
+      type: array
+      example:
+        - id: 123
+          name: bob
+        - id: 456
+          name: jane
+      xml:
+        name: Users
+        wrapped: true
+      items:
+        type: object
+        xml:
+          name: User
+        properties:
+          id:
+            type: integer
+            xml:
+              attribute: true
+          name:
+            type: string
+            xml:
+              attribute: true

test/e2e-cypress/tests/bugs/6627.js

+describe("#6627: XML example when defined as array", () => {
+  it("should render xml like json", () => {
+    const expected = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<Users>\n\t<User id=\"123\" name=\"bob\">\n\t</User>\n\t<User id=\"456\" name=\"jane\">\n\t</User>\n</Users>"
+    cy
+      .visit("/?url=/documents/bugs/6627.yaml")
+      .get("#operations-default-get_users")
+      .click()
+      .get(".microlight")
+      .contains(expected)
+  })
+})