The window state action is not an atom.
@ -2619,7 +2619,7 @@ void _glfwPlatformSetWindowFloating(_GLFWwindow* window, GLFWbool enabled)
if (_glfwPlatformWindowVisible(window))
{
const Atom action = enabled ? _NET_WM_STATE_ADD : _NET_WM_STATE_REMOVE;
const long action = enabled ? _NET_WM_STATE_ADD : _NET_WM_STATE_REMOVE;
sendEventToWM(window,
_glfw.x11.NET_WM_STATE,
action,