Sdk/Canvas: Fix crash at Canvas destruction

SDK/include/NDK/BaseWidget.hpp

@@ -89,6 +89,7 @@ namespace Ndk
 			inline BaseWidget();
 
 			inline void DestroyChild(BaseWidget* widget);
+			void DestroyChildren();
 			inline void NotifyParentResized(const Nz::Vector2f& newSize);
 			inline void UpdateCanvasIndex(std::size_t index);
 

SDK/include/NDK/Canvas.hpp

@@ -23,7 +23,7 @@ namespace Ndk
 			inline Canvas(WorldHandle world, Nz::EventHandler& eventHandler);
 			Canvas(const Canvas&) = delete;
 			Canvas(Canvas&&) = delete;
-			~Canvas() = default;
+			inline ~Canvas();
 
 			inline const WorldHandle& GetWorld() const;
 

SDK/include/NDK/Canvas.inl

@@ -22,6 +22,12 @@ namespace Ndk
 		m_textEnteredSlot.Connect(eventHandler.OnTextEntered, this, &Canvas::OnTextEntered);
 	}
 
+	inline Canvas::~Canvas()
+	{
+		// Destroy children explicitly because they signal us when getting destroyed, and that can't happend after our own destruction
+		DestroyChildren();
+	}
+
 	inline const WorldHandle& Canvas::GetWorld() const
 	{
 		return m_world;