Merge branch '4' into 0.4

code/fields/GridFieldTestNavigation.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace SilverStripe\FrameworkTest\Fields\Admin;
+
+use SilverStripe\Admin\ModelAdmin;
+use SilverStripe\FrameworkTest\Model\Company;
+
+class GridFieldTestNavigation extends ModelAdmin
+{
+    private static string $url_segment = 'gridfield-test-navigation';
+    private static string $menu_title = 'GridField Test Navigation';
+    private static string $menu_icon_class = 'font-icon-block-banner';
+
+    private static array $managed_models = [
+        Company::class,
+    ];
+
+    private static $page_length = 5;
+}