[META] 7.x-2.x roadmap

TODO: switch version to 2.x once branch is available.

1. clean up the data structure so that it becomes more dx-friendly and predictable (and to faciliitate update hooks).
2. alter the form structure *after* hook_form_alter() (expected to improve DX and fix compatibility issues with other modules)
3. make the theme implementation as generic as possible (matching the default wrappers more closely, maybe even providing a theme hook)
4. make the tree handing more robust by referencing parents and adjusting the depth for missing parents
5. include items_per_page as sortable item
6. get rid of predefined containers by ajaxifying the sort form

Update:

An initial rewrite is now available in the 7.x-2.x branch. It introduces the following changes:

• Item types and their forms are managed by classes extending ViewsEFFieldsetItemType. New types and classes can be registered via hook_views_ef_fieldset_item_types().
• The extender no longer modifies the exposed form options form, but uses its own form instead. Items can be added dynamically.
• The form is no longer built in a form alter, but instead uses #after_build. Affected form elements no longer get unset, instead they are marked as #printed = true.
• Affected widgets now use a custom template that matches the default markup provided by views-exposed-form.tpl.php.
• The CSS fix for floated collapsed fieldsets has been revised. Floats on views widgets are no longer removed.
• The tree constructor should handle missing parents more gracefully now.

7.x-1.x features yet to be reintroduced:

• A configurable description for fieldsets.
• Vertical tabs.
• Collapse if inactive: This feature is somewhat broken in 1.x as it only checks if there is any exposed input.

Other tasks that are still left:

• Performance optimizations for item retrieval (currently there are a lot of round trips).
• Proper handling of overridden default options.
• Handling of filter groups (behavior not yet tested).