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<?php
add_action( 'admin_init', 'my_deregister_editor_expand' );
function my_deregister_editor_expand() {
  wp_deregister_script('editor-expand');
}

add_filter( 'tiny_mce_before_init', 'my_unset_autoresize_on' );
function my_unset_autoresize_on( $init ) {
  unset( $init['wp_autoresize_on'] );
  return $init;
}