Children of external views don't render when iframe is set to true

[hanpov]

Spring Boot Admin Server information

• Version: 3.4.3

• Spring Boot version: 3.4.3

• Configured Security: basic auth

• Webflux or Servlet application: Servlet

Client information

• Spring Boot versions: 3.4.4

• Used discovery mechanism: consul

• Webflux or Servlet application: Servlet

Description

The property iframe does not work for children of external-views. Essentially, taking an example from the samples, doing this doesn't work:

spring:
  boot:
    admin:
      ui:
        external-views:
          - label: Link w/o children
            children:
              - label: "📖 Docs"
                url: https://codecentric.github.io/spring-boot-admin/current/
                iframe: true
              - label: "📦 Maven"
                url: https://search.maven.org/search?q=g:de.codecentric%20AND%20a:spring-boot-admin-starter-server
                iframe: true

Vue.js throws an error about not finding a route to build the list of children for the dropdown.