LibGUI: Implement set_max_size

I already support set_min_size so why not this :)

userspace/libraries/LibGUI/Window.cpp

@@ -178,6 +178,16 @@ namespace LibGUI
 			return on_socket_error(__FUNCTION__);
 	}
 
+	void Window::set_max_size(uint32_t width, uint32_t height)
+	{
+		WindowPacket::WindowSetMaxSize packet;
+		packet.width = width;
+		packet.height = height;
+
+		if (auto ret = packet.send_serialized(m_server_fd); ret.is_error())
+			return on_socket_error(__FUNCTION__);
+	}
+
 	void Window::set_attributes(Attributes attributes)
 	{
 		WindowPacket::WindowSetAttributes packet;

userspace/libraries/LibGUI/include/LibGUI/Packet.h

@@ -165,6 +165,7 @@ namespace LibGUI
 		WindowSetMouseCapture,
 		WindowSetSize,
 		WindowSetMinSize,
+		WindowSetMaxSize,
 		WindowSetFullscreen,
 		WindowSetTitle,
 
@@ -234,6 +235,12 @@ namespace LibGUI
 			uint32_t, height
 		);
 
+		DEFINE_PACKET(
+			WindowSetMaxSize,
+			uint32_t, width,
+			uint32_t, height
+		);
+
 		DEFINE_PACKET(
 			WindowSetFullscreen,
 			bool, fullscreen

userspace/libraries/LibGUI/include/LibGUI/Window.h

@@ -47,6 +47,7 @@ namespace LibGUI
 		void set_attributes(Attributes attributes);
 
 		void set_min_size(uint32_t width, uint32_t height);
+		void set_max_size(uint32_t width, uint32_t height);
 
 		// send resize request to window server
 		// actual resize is only done after resize callback is called