long worm tail hit by potion thrown by monster (trunk only)

From the newsgroup:  when a monster throws a potion at the hero and
it hits a long worm's tail, you'd get "The bottle|flask|&c crashes on the
long worm's _head_ and breaks into shards."  The relevant code changes
"head" to "body" when appropriate, but monster throwing wasn't setting up
`notonhead' so that alteration only kicked in for player throwing.

doc/fixes35.0

@@ -273,6 +273,8 @@ always update map display and use up turn if open or close command attempted
 	while blind reveals change in door state or discloses non-door spot
 secret door detection's trap finding is no longer blocked by water or clouds
 	on the Planes of Water and Air
+potion thrown by monster which hit a long worm's tail gave feedback about
+	hitting its head
 
 
 Platform- and/or Interface-Specific Fixes

src/dothrow.c

@@ -929,6 +929,7 @@ boolean twoweap; /* used to restore twoweapon mode if wielded weapon returns */
 		impaired = (Confusion || Stunned || Blind ||
 			   Hallucination || Fumbling);
 
+	notonhead = FALSE;	/* reset potentially stale value */
 	if ((obj->cursed || obj->greased) && (u.dx || u.dy) && !rn2(7)) {
 	    boolean slipok = TRUE;
 	    if (ammo_and_launcher(obj, uwep))

src/mthrowu.c

@@ -1,4 +1,4 @@
-/*	SCCS Id: @(#)mthrowu.c	3.5	2007/06/07	*/
+/*	SCCS Id: @(#)mthrowu.c	3.5	2007/12/17	*/
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /* NetHack may be freely redistributed.  See license for details. */
 
@@ -26,6 +26,8 @@ STATIC_OVL NEARDATA const char *breathwep[] = {
 				"strange breath #9"
 };
 
+extern boolean notonhead;	/* for long worms */
+
 /* hero is hit by something other than a monster */
 int
 thitu(tlev, dam, obj, name)
@@ -129,7 +131,7 @@ int x,y;
    return 1 if the object has stopped moving (hit or its range used up) */
 int
 ohitmon(mtmp, otmp, range, verbose)
-struct monst *mtmp;	/* accidental target */
+struct monst *mtmp;	/* accidental target, located at <bhitpos.x,.y> */
 struct obj *otmp;	/* missile; might be destroyed by drop_throw */
 int range;		/* how much farther will object travel if it misses */
 			/* Use -1 to signify to keep going even after hit, */
@@ -140,6 +142,7 @@ boolean verbose;  /* give message(s) even when you can't see what happened */
 	boolean vis, ismimic;
 	int objgone = 1;
 
+	notonhead = (bhitpos.x != mtmp->mx || bhitpos.y != mtmp->my);
 	ismimic = mtmp->m_ap_type && mtmp->m_ap_type != M_AP_MONSTER;
 	vis = cansee(bhitpos.x, bhitpos.y);
 
@@ -245,6 +248,7 @@ struct obj *obj;		/* missile (or stack providing it) */
 
 	bhitpos.x = x;
 	bhitpos.y = y;
+	notonhead = FALSE;	/* reset potentially stale value */
 
 	if (obj->quan == 1L) {
 	    /*