It seems to me that addbytes() (and thus addch()) should return ERR if

It seems to me that addbytes() (and thus addch()) should return ERR if
you try to go past the end of the window and SCROLLOK is not set.  The
old code also used to do this; the current code does not.
This breaks at least one program, mille(6).
From: Charles Hannum <mycroft@sun-lamp.cs.berkeley.edu>

SCCS-vsn: lib/libcurses/addbytes.c 8.3