<option> and <optgroup> cannot be modified per-elementoptgroup and #type optioncheckboxes and radios except for the fact that it supports arrays as value which get expanded into optgroup elements\Drupal\Core\Render\Element\Select::preRender() is duplicated by template_preprocess_select() and the former is not called by #type language_select elementsNone.
\Drupal\Core\Form\OptGroup::flattenOptions() is moved to \Drupal\Core\Render\Element\Optgroup as it would be confusing to have two different OptGroup classes doing similar things; as part of the moving the separate protected method doFlattenOptions() is removed as it is unnecessary and can be replaced by a recursive call to flattenOptions()form_flatten_options() is removed; this is not technically necessary, but was easy enough to do hereform_select_options() is removedNULL as this is rather pointlessoptions member variable in #options as this is rather pointlessNeeds work
11.0 🔥
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Attempted reroll for 10.1.x and 11.x
Would request if this could be turned into an MR 42KB is pretty large file and MRs would be easier to review. Moving to NW for CC failure.