Ticket #31002: 31002.diff

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

@@ -416 +416 @@
                                                 break;
                                         case 'latest_installed':
                                         case 'newer_installed':
-                                                $action_links[] = '<span class="button button-disabled" title="' . esc_attr__( 'This plugin is already installed and is up to date' ) . ' ">' . _x( 'Installed', 'plugin' ) . '</span>';
+                                                $plugins = get_plugins( '/' . $plugin['slug'] );
+                                                if ( ! empty( $plugins ) ) {
+                                                        $keys = array_keys( $plugins );
+                                                        $plugin_file = $plugin['slug'] . '/' . $keys[0];
+                                                }
+                                                if ( ! is_plugin_active( $plugin_file ) ) {
+                                                        $action_links[] = '<a class="button" href="' . wp_nonce_url( 'plugins.php?action=activate&amp;plugin=' . $plugin_file, 'activate-plugin_' . $plugin_file ) . '" title="' . esc_attr__( 'Activate this plugin' ) . '" target="_parent">' . _x( 'Activate', 'plugin' ) . '</a>';
+                                                } else {
+                                                        $action_links[] = '<span class="button button-disabled" title="' . esc_attr__( 'This plugin is already installed and is up to date' ) . ' ">' . _x( 'Installed', 'plugin' ) . '</span>';
+                                                }
                                                 break;
                                 }
                         }