Make ui::single_container release children on destroy

libs/ui/include/psemek/ui/frame.hpp

@@ -15,8 +15,6 @@ namespace psemek::ui
 		virtual std::optional<geom::vector<float, 2>> min_size() const { return min_size_; }
 		virtual std::optional<geom::vector<float, 2>> max_size() const { return max_size_; }
 
-		~frame() override;
-
 	private:
 		std::optional<geom::vector<float, 2>> min_size_;
 		std::optional<geom::vector<float, 2>> max_size_;

libs/ui/include/psemek/ui/scroller.hpp

@@ -38,8 +38,6 @@ namespace psemek::ui
 		void draw(painter & p) const override;
 		void post_draw(painter & p) const override;
 
-		~scroller() override;
-
 	protected:
 
 		virtual float width() const;

libs/ui/include/psemek/ui/single_container.hpp

@@ -13,6 +13,8 @@ namespace psemek::ui
 		virtual std::shared_ptr<element> set_child(std::shared_ptr<element> c);
 		virtual std::shared_ptr<element> child() { return child_; }
 
+		~single_container() override;
+
 	protected:
 		std::shared_ptr<element> child_;
 		element * children_[1]{nullptr};

libs/ui/source/frame.cpp

@@ -22,9 +22,4 @@ namespace psemek::ui
 		post_reshape();
 	}
 
-	frame::~frame()
-	{
-		release_children();
-	}
-
 }

libs/ui/source/scroller.cpp

@@ -291,11 +291,6 @@ namespace psemek::ui
 		p.end_stencil();
 	}
 
-	scroller::~scroller()
-	{
-		release_children();
-	}
-
 	float scroller::width() const
 	{
 		return 0;

libs/ui/source/single_container.cpp

@@ -15,4 +15,9 @@ namespace psemek::ui
 		return old;
 	}
 
+	single_container::~single_container()
+	{
+		release_children();
+	}
+
 }