Mark `WP_List_Table::bulk_actions()`'s argument `$which` as optional for BC.
Fixes #29026. git-svn-id: https://develop.svn.wordpress.org/trunk@29440 602fd350-edb4-49c9-b593-d223f7449a82
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@ -345,8 +345,9 @@ class WP_List_Table {
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* @access protected
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*
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* @param string $which The location of the bulk actions: 'top' or 'bottom'.
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* This is designated as optional for backwards-compatibility.
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*/
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protected function bulk_actions( $which ) {
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protected function bulk_actions( $which = '' ) {
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if ( is_null( $this->_actions ) ) {
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$no_new_actions = $this->_actions = $this->get_bulk_actions();
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/**
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