Request meta_form meta_key hook

  • /wp-admin/includes/template.php
    The meta_form() function should have a hook after setting $keys to be able to modify the array of meta_keys before the HTML <options> are created. Something similar to:

    $keys = apply_filters( 'postmeta_form_meta_keys', $keys );

    The only option now is to modify the query using the query filter.

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