Ticket #58370: 58370.diff

src/wp-admin/includes/plugin-install.php

@@ -899 +899 @@
                                 echo '<a class="button button-primary right disabled">' . __( 'Latest Version Installed' ) . '</a>';
                                 break;
                 }
+
+                $installed_plugin = get_plugins( '/' . $api->slug );
+        $key = array_keys( $installed_plugin );
+        // Use the first plugin regardless of the name.
+        // Could have issues for multiple plugins in one directory if they share different version numbers.
+        $key = reset( $key );
+
+        $plugin_file = $api->slug . '/' . $key;
+
+        if ( is_network_admin() ) {
+            $is_active  = is_plugin_active_for_network( $plugin_file );
+        } else {
+            $is_active  = is_plugin_active( $plugin_file );
+        }
+
+        if ( !$is_active ) {
+            echo sprintf(
+                '<a href="%s" id="activate-%s" style="margin-right: 6px" class="button button-primary right" aria-label="%s" target="_parent">%s</a>',
+                wp_nonce_url('plugins.php?action=activate&amp;plugin=' . urlencode($plugin_file) . '&amp;plugin_status=' . $status['status'] . '&amp;paged=' . $page . '&amp;s=' . $s, 'activate-plugin_' . $plugin_file),
+                esc_attr($api->slug),
+                /* translators: %s: Plugin name. */
+                esc_attr(sprintf(_x('Activate %s', 'plugin'), $api->name)),
+                __('Activate')
+            );
+        }
         }
         echo "</div>\n";