This is why it makes me sad:

class decor{
	Window[] decorations;
	Window container;
	Window client;
	
	XWindowAttributes attr;
	
	this(Window cli, XWindowAttributes a){
		decorations = new Window[numOfWin];
                ...

It seems like a lot less work for the machine if I could do:

class decor{
	Window[numOfWin] decorations;
	Window container;
	Window client;
	
	XWindowAttributes attr;
	
	this(Window cli, XWindowAttributes a){
		...