Page Alias - loses app header

[DavieReid]

When you give a page an alias, the alias works fine and the page content etc is visible. However, the app header content is removed so it looks empty.

I think it might be related to the shared config being lost somehow

[DavieReid]

confirmed the shared config is lost. Investigating further

[DavieReid]

Shared Config Flow

1. frameOverrides added to site index page (usually)
2. CodeModPlugin (first plugin to run) detects the frameOverrides property
3. CodeModPlugin sets page.sharedConfig to be the same as frameOverrides
4. CodeModPlugin sets page.frameOverrides to reference the new sharedConfig property
5. SharedConfigPlugin runs and detects the sharedConfig property
6. SharedConfigPlugin writes the shared config out to a json file
7. SharedConfigPlugin creates a ref to the shared config json file
8. User requests a page
9. SharedConfig middleware uses the requested page url to find the shared config json file

The broken part:
When the page uses an alias, the SharedConfig middleware won't find the shared config json file.

Example

1. Request page /mosaic/author/aliases
2. Shared config should be located at /mosaic/author/shared-config.json

But this page also provides an alias:

1. Request alias /mosaic/example/aliases
2. There is NO json file at /mosaic/example/shared-config.json

[DavieReid]

Workaround is to manually ref the shared config in the aliased page frontmatter

sharedConfig:
  $ref: /mosaic/index#/sharedConfig