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bargethrough/monster-vs-monster displacing

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Fix the regression that monster movement flag unification
introduced for monsters able to swap places with adjacent
monsters.  It used to be restricted in order to prevent
Riders swapping places with other Riders so that they didn't
repeatedly exchange places when one was right behind the other
and the farther one moved first.  Then when displacer beasts
were added, that restriction was extended to prevent them
swapping places with Riders (but not the other way around.)
The flags change inadvertently let any displacer swap with any
other displacer.
This commit is contained in:
PatR
2020-12-13 15:51:23 -08:00
parent 04724fc5a0
commit e9d729733b
2 changed files with 7 additions and 3 deletions
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7
src/mon.c
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@@ -1,4 +1,4 @@
/* NetHack 3.7 mon.c $NHDT-Date: 1607374002 2020/12/07 20:46:42 $ $NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.359 $ */
/* NetHack 3.7 mon.c $NHDT-Date: 1607901923 2020/12/13 23:25:23 $ $NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.360 $ */
/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
/*-Copyright (c) Derek S. Ray, 2015. */
/* NetHack may be freely redistributed. See license for details. */
@@ -1586,8 +1586,10 @@ struct monst *mtmp;
allowflags |= UNLOCKDOOR;
if (passes_bars(mtmp->data))
allowflags |= ALLOW_BARS;
#if 0 /* can't do this here; leave it for mfndpos() */
if (is_displacer(mtmp->data))
allowflags |= ALLOW_MDISP;
#endif
if (is_minion(mtmp->data) || is_rider(mtmp->data))
allowflags |= ALLOW_SANCT;
/* unicorn may not be able to avoid hero on a noteleport level */
@@ -1712,7 +1714,7 @@ long flag;
|| (m_at(x, ny) && m_at(nx, y) && worm_cross(x, y, nx, ny)
&& !m_at(nx, ny) && (nx != u.ux || ny != u.uy))))
continue;
if ((is_pool(nx, ny) == wantpool || poolok)
if ((poolok || is_pool(nx, ny) == wantpool)
&& (lavaok || !is_lava(nx, ny))) {
int dispx, dispy;
boolean monseeu = (mon->mcansee
@@ -1764,6 +1766,7 @@ long flag;
info[cnt] |= ALLOW_TM;
}
} else {
flag &= ~ALLOW_MDISP; /* depends upon defender */
mmflag = flag | mm_displacement(mon, mtmp2);
if (!(mmflag & ALLOW_MDISP))
continue;