xwm: implement _NET_CLIENT_LIST_STACKING

This property is present on all modern X11 instances. The nonpresence of
it requires applications to fall back to XQueryTree-based logic to
determine stacking logic (e.g., to determine what surface should get
Xdnd events).

These code paths are effectively untested nowadays, so this makes it
more likely for wlroots to "break" applications. For instance, the
XQueryTree fallback path has been broken in Chromium for the last 10
years.

It's easy enough to maintain this property, so let's just do it.

Fixes #2889.

include/xwayland/xwm.h

@@ -80,6 +80,7 @@ enum atom_name {
 	DND_ACTION_ASK,
 	DND_ACTION_PRIVATE,
 	NET_CLIENT_LIST,
+	NET_CLIENT_LIST_STACKING,
 	ATOM_LAST // keep last
 };
 
@@ -106,7 +107,10 @@ struct wlr_xwm {
 
 	struct wlr_xwayland_surface *focus_surface;
 
+	// Surfaces in creation order
 	struct wl_list surfaces; // wlr_xwayland_surface::link
+	// Surfaces in bottom-to-top stacking order, for _NET_CLIENT_LIST_STACKING
+	struct wl_list surfaces_in_stack_order; // wlr_xwayland_surface::stack_link
 	struct wl_list unpaired_surfaces; // wlr_xwayland_surface::unpaired_link
 
 	struct wlr_drag *drag;