LibGUI/WindowServer: Implement per-window cursor hiding

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

@@ -234,6 +234,7 @@ namespace LibGUI
 			bool alpha_channel;
 			bool resizable;
 			bool shown;
+			bool cursor_visible;
 		};
 
 		DEFINE_PACKET(

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

@@ -26,6 +26,7 @@ namespace LibGUI
 			.alpha_channel   = false,
 			.resizable       = false,
 			.shown           = true,
+			.cursor_visible  = true,
 		};
 
 	public:
@@ -48,6 +49,8 @@ namespace LibGUI
 
 		void set_position(int32_t x, int32_t y);
 
+		void set_cursor_visible(bool visible);
+
 		Attributes get_attributes() const { return m_attributes; }
 		void set_attributes(Attributes attributes);
 

userspace/programs/WindowServer/WindowServer.cpp

@@ -1201,6 +1201,8 @@ void WindowServer::sync()
 
 Rectangle WindowServer::cursor_area() const
 {
+	if (auto window = find_hovered_window(); window && !window->get_attributes().cursor_visible)
+		return { m_cursor.x, m_cursor.y, 0, 0 };
 	return { m_cursor.x, m_cursor.y, s_cursor_width, s_cursor_height };
 }
 
@@ -1241,14 +1243,19 @@ Rectangle WindowServer::resize_area(Position cursor) const
 	};
 }
 
-BAN::RefPtr<Window> WindowServer::find_window_with_fd(int fd)
+BAN::RefPtr<Window> WindowServer::find_window_with_fd(int fd) const
 {
 	for (auto window : m_client_windows)
-	{
+		if (window->client_fd() == fd)
-		if (window->client_fd() != fd)
+			return window;
-			continue;
+	return {};
+}
+
+BAN::RefPtr<Window> WindowServer::find_hovered_window() const
+{
+	for (auto window : m_client_windows)
+		if (window->full_area().contains(m_cursor))
 			return window;
-	}
 	return {};
 }
 

userspace/programs/WindowServer/WindowServer.h

@@ -66,7 +66,8 @@ private:
 
 	bool resize_window(BAN::RefPtr<Window> window, uint32_t width, uint32_t height) const;
 
-	BAN::RefPtr<Window> find_window_with_fd(int fd);
+	BAN::RefPtr<Window> find_window_with_fd(int fd) const;
+	BAN::RefPtr<Window> find_hovered_window() const;
 
 private:
 	struct RangeList