Perform a cleaner exit for resource preview, fixes #24206

editor/editor_resource_preview.h

@@ -126,6 +126,8 @@ public:
 	void remove_preview_generator(const Ref<EditorResourcePreviewGenerator> &p_generator);
 	void check_for_invalidation(const String &p_path);
 
+	void stop();
+
 	EditorResourcePreview();
 	~EditorResourcePreview();
 };