I'm writing my own minimalistic window manager in C++ and a tutorial on that. In order to make my interfaces safe for changes then I need to... well... know what the changes are :P . I know about XComposite and XDamage (though haven't done any coding with them), they seem really great and should have been in X from the start. But are there any other features on the horizon that I should be aware of and plan for? Thx