- Fixes an issue where themes would cascade "up" the list of themes
- Provides configuration for defining custom theme options with their own sets of cascading themes
Fixes#392
We now check the subsite state for the context and validate it against the current member's
group permissions using the SilverStripe ORM relationships instead of using SQL queries.
More granular permission checks e.g. canView etc are still up to data models to define and
handle.
SilverStripe CMS 4.0.0 issues a deprecation notice before calling
alternatePreviewLink on any page that hasMethod (i.e. is applied via an
extension such as SiteTreeSubsites). Instead of double-issuing a notice,
we will just mark this as deprecated in the next minor version via
docblocks.
A preview link must be loaded on the same domain the CMS is loaded
through, which was previously causing issues when a page (identified
via URLSegment) did not exist on the subsite domain. By _always_
prepending the identifier to the preview link, this should never happen.