Breaking: #79622 - Default layouts for Fluid Styled Content changed

See Issue #79622

Description

The content element layouts for Fluid Styled Content have been changed to provide a better maintainability and to be more flexible.

Previously available content element layouts ContentFooter, HeaderFooter and HeaderContentFooter have been dropped and replaced with a single Default layout that is more flexible.

Impact

The content element layouts ContentFooter, HeaderFooter and HeaderContentFooter are no longer available. Referencing these layouts will result in an exception.

Affected Installations

All instances that override or implement custom content elements based on Fluid Styled Content that use the layouts ContentFooter, HeaderFooter or HeaderContentFooter.

Migration

All content elements and overrides need to be migrated to the new default layout. Have a look at the feature description on how to use the new layout.

Feature-79622-NewDefaultLayoutForFluidStyledContent.rst