Don't show the "Get Shortlink" button for pages with a ?page_id=x per…

…malink.

Props sillybean
fixes #14760

Built from https://develop.svn.wordpress.org/trunk@25122


git-svn-id: http://core.svn.wordpress.org/trunk@25102 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/edit-form-advanced.php

@@ -368,7 +368,8 @@
 <?php
 $sample_permalink_html = $post_type_object->public ? get_sample_permalink_html($post->ID) : '';
 $shortlink = wp_get_shortlink($post->ID, 'post');
-if ( !empty( $shortlink ) && $shortlink !== get_permalink( $post->ID ) )
+$permalink = get_permalink( $post->ID );
+if ( !empty( $shortlink ) && $shortlink !== $permalink && $permalink !== home_url('?page_id=' . $post->ID) )
     $sample_permalink_html .= '<input id="shortlink" type="hidden" value="' . esc_attr($shortlink) . '" /><a href="#" class="button button-small" onclick="prompt(&#39;URL:&#39;, jQuery(\'#shortlink\').val()); return false;">' . __('Get Shortlink') . '</a>';
 
 if ( $post_type_object->public && ! ( 'pending' == get_post_status( $post ) && !current_user_can( $post_type_object->cap->publish_posts ) ) ) {