Performance: replace sylesheets[all][] with attached

Thanks for the patch, we'll try to review it soon.

BTW when you upload a patch it helps to set the status to "needs review", that triggers the testbots and lets others know that there's something review.

Patch no longer apply.

git apply -v performance_replace-2447277-1.patch
Checking patch date.field.inc...
error: while searching for:
 *     start date and the repeat rule will be displayed.
 */
function date_field_formatter_view($entity_type, $entity, $field, $instance, $langcode, $items, $display) {
  $element = array();
  $settings = $display['settings'];
  $formatter = $display['type'];
  $variables = array(

error: patch failed: date.field.inc:113
error: date.field.inc: patch does not apply

Manually re-rolled. Seems to work just fine.

This looks good, thanks.

Committed.

This change seems to have missed some places where `date_api/data.css` is needed. See new issue: #3067396: Date CSS not added for all Form API elements