#define MARK_DEVICE_WINDOWS_STRUCTURE_CHANGED(d) \
((void) (windows_structure_changed = (d)->windows_structure_changed = 1))
+/* #### unify this with DOMAIN_DEVICE once the latter has image instances
+ expunged from it. */
/* This turns out to be used heavily so we make it a macro to make it
inline. Also, the majority of the time the object will turn out to
be a window so we move it from being checked last to being checked