In doing the Twig conversion, we are moving many concatenation-based theme functions into templates. Some of these are for administrative forms, which are based on tables.
Most of these follow a similar design pattern:
HEADING
-------
[ Global operation button(s) ]
[ Filter form ]
[ Operations form ]
[ Show/hide details link ]
+===========================================+
| HEADING | HEADING | OPERATIONS |
+================+=============+============+
| Foo | Oof | edit del +
+ ---------------|-------------|------------+
| Bar | Rab | edit del +
+ ---------------|-------------|------------+
| Baz | Zab | edit del +
+===========================================+
[ Global operation button(s) ]This pattern is similar to what we sometimes accomplish with http://drupal.org/project/views_bulk_operations
Below are some URLs in core where these exist (this is not an exhaustive list).
/admin/content
/admin/content/comment
/admin/structure/types
/admin/people
/admin/people/roles
/admin/config/content/formats
/admin/config/media/image-styles
/admin/config/regional/date-time
/admin/modules (similar)
Many of these provide a theme function to style the form they use. It seems better that we should provide instead a consolidated "administrative interface" theme component so that we can reduce the duplication in the theme system