Ticket #33313: 33313.3.diff

src/wp-admin/css/list-tables.css

@@ -1764 +1764 @@
                 font-size: 14px;
         }
 
-        .wp-list-table th:not(.column-primary),
-        .wp-list-table th:not(.column-primary),
-        .wp-list-table tr:not(.inline-edit-row):not(.no-items) td:not(.column-primary):not(.check-column) {
+        .wp-list-table th.column-primary ~ th,
+        .wp-list-table tr:not(.inline-edit-row):not(.no-items) td.column-primary ~ td:not(.check-column) {
                 display: none;
         }
 
@@ -1780 +1779 @@
                 width: 35px;
         }
 
-        .wp-list-table .toggle-row {
+        .wp-list-table .column-primary .toggle-row {
                 display: block;
         }
 
@@ -1795 +1794 @@
                 padding-right: 50px; /* space for toggle button */
         }
 
-        .wp-list-table tr:not(.inline-edit-row):not(.no-items) td:not(.column-primary):not(.check-column) {
+        .wp-list-table tr:not(.inline-edit-row):not(.no-items) td.column-primary ~ td:not(.check-column) {
                 padding: 3px 8px 3px 35%;
         }
 

src/wp-admin/includes/class-wp-list-table.php

@@ -1258 +1258 @@
          * @return string The row actions output. In this case, an empty string.
          */
         protected function handle_row_actions( $item, $column_name, $primary ) {
-                return '';
+                return $column_name == $primary ? '<button type="button" class="toggle-row"><span class="screen-reader-text">' . __( 'Show more details' ) . '</span></button>' : '';
         }
 
         /**