Problem/Motivation
In #2994696-198: Render embedded media items in CKEditor, @effulgentsia requested:
This warrants a theme hook, so that themes can override the markup and classes.
"This" refers to the error message that the media_embed filter will output for media items that cannot be loaded for rendering during text processing. Right now, the message and its container is not themeable.
Proposed resolution
Make the error message themeable, possibly by adding a new theme hook.
Remaining tasks
Determine the best way to do this, and make it happen.
User interface changes
None.
API changes
Potentially a new theme hook; TBD.
Data model changes
None anticipated.
Release notes snippet
TBD.