Wrong breadcrumbs order for nested navigation items

[Silthus]

Originally posted on rtd: readthedocs/readthedocs.org#7263

Details

• Read the Docs project URL: https://art.silthus.net/en/latest/admin/syntax/
• Build URL (if applicable): https://github.com/art-framework/art-framework/blob/alpha/mkdocs.yml
• Read the Docs username (if applicable): Silthus

Expected Result

The breadcrumbs on the top of the page should be ordered according to the navigation tree.
The breadcrumbs should show Docs >> Server Admins >> ART Syntax >> Requirements instead.

Actual Result

The breadcrumbs are switched when going beyond three levels deep into the navigation.

This is my config:

site_name: ART-Framework
site_description: 'Home of the documentation for the ART-Framework.'
site_author: 'Michael Reichenbach'
docs_dir: docs/
repo_url: 'https://github.com/art-framework/art-framework'
nav:
  - Home: index.md
  - 'Server Admins':
    - 'Quickstart': 'admin/quickstart.md'
    - 'Installation': 'admin/installation.md'
    - 'ART Syntax':
      - 'General Syntax': 'admin/syntax.md'
      - 'Actions': 'admin/actions.md'
      - 'Requirements': 'admin/requirements.md'
      - 'Trigger': 'admin/trigger.md'
  - 'Developers':
    - 'Quickstart': 'developer/quickstart.md'
    - 'Creating ART':
      - 'Actions': 'developer/actions.md'
      - 'Requirements': 'developer/requirements.md'
      - 'Trigger': 'developer/trigger.md'
  - 'Issue Tracker': 'https://github.com/art-framework/art-framework/issues'
  - 'About': 'about.md'
theme:
  name: 'readthedocs'

[jkozera]

Reversing the ancestors property before rendering seems to fix the issue for me - see the just-submitted PR #2179.