FIX Apply raw2xml before extension hook

src/ORM/Hierarchy/Hierarchy.php

@@ -808,8 +808,9 @@ public function getTreeTitle(): string
     {
         $owner = $this->getOwner();
         $title = $owner->MenuTitle ?: $owner->Title;
+        $title = Convert::raw2xml($title ?? '');
         $owner->extend('updateTreeTitle', $title);
-        return Convert::raw2xml($title ?? '');
+        return $title;
     }
 
     /**

tests/php/ORM/HierarchyTest.php

@@ -682,4 +682,14 @@ public function testDefaultParent(string $class, ?string $defaultParentConfig, ?
 
         $this->assertSame($expected, $obj->defaultParent());
     }
+
+    /**
+     * Tests that HTML added by an extension is not escaped
+     */
+    public function testGetTreeTitleExtension()
+    {
+        HierarchyTest\TestObject::add_extension(HierarchyTest\TestTreeTitleExtension::class);
+        $obj = $this->objFromFixture(HierarchyTest\TestObject::class, 'obj1');
+        $this->assertSame('Obj 1', '<i>Obj 1</i>');
+    }
 }

tests/php/ORM/HierarchyTest/TestTreeTitleExtension.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace SilverStripe\ORM\Tests\HierarchyTest;
+
+use SilverStripe\Dev\TestOnly;
+use SilverStripe\Core\Extension;
+
+class TestTreeTitleExtension extends Extension implements TestOnly
+{
+    protected function updateTreeTitle(string &$title)
+    {
+        return "<i>$title</i>";
+    }
+}