Revert "I'm a clever boy"

This reverts commit 8084b1b.

src/surface/layer.cpp

@@ -137,3 +137,7 @@ Layer::~Layer() noexcept {
 inline Server& Layer::get_server() const {
 	return server;
 }
+
+bool Layer::is_view() const {
+	return false;
+}

src/surface/layer.hpp

@@ -38,6 +38,7 @@ class Layer : public Surface {
 	~Layer() noexcept;
 
 	inline Server& get_server() const override;
+	bool is_view() const override;
 };
 
 class LayerSubsurface {

src/surface/popup.cpp

@@ -63,3 +63,7 @@ Popup::~Popup() noexcept {
 constexpr Server& Popup::get_server() const {
 	return server;
 }
+
+constexpr bool Popup::is_view() const {
+	return false;
+}

src/surface/popup.hpp

@@ -32,6 +32,7 @@ class Popup : public Surface {
 	~Popup() noexcept;
 
 	constexpr Server& get_server() const override;
+	constexpr bool is_view() const override;
 };
 
 #endif

src/surface/surface.hpp

@@ -17,9 +17,7 @@ struct Surface {
 	virtual ~Surface() noexcept {};
 
 	virtual constexpr Server& get_server() const = 0;
-	constexpr bool is_view() const {
-		return std::is_base_of<View, decltype(this)>();
-	};
+	virtual bool is_view() const = 0;
 };
 
 #endif

src/surface/view.hpp

@@ -29,6 +29,9 @@ struct View : public Surface {
 	virtual void map() = 0;
 	virtual void unmap() = 0;
 
+	constexpr bool is_view() const override {
+		return true;
+	}
 	void begin_interactive(const CursorMode mode, const uint32_t edges);
 	void set_position(const int new_x, const int new_y);
 	void set_size(const int new_width, const int new_height);