post_edit_form_tag
Action Hook: Fires inside the post editor form tag.
Source: wp-admin/edit-form-advanced.php:519
edit_form_top
Action Hook: Fires at the beginning of the edit form.
Source: wp-admin/edit-form-advanced.php:556
wp_editor_expand
Filter Hook: Filters whether to enable the ‘expand’ functionality in the post editor.
Source: wp-admin/edit-form-advanced.php:56