When removing an object from the floor, force concealed hiders to unh…

…ide. Fixes C343-308.

Conflicts:

	libnethack/src/invent.c

src/invent.c

@@ -632,6 +632,7 @@ delobj(obj)
 register struct obj *obj;
 {
 	boolean update_map;
+        struct monst *mtmp;
 
 	if (obj->otyp == AMULET_OF_YENDOR ||
 			obj->otyp == CANDELABRUM_OF_INVOCATION ||
@@ -646,6 +647,12 @@ register struct obj *obj;
 	}
 	update_map = (obj->where == OBJ_FLOOR);
 	obj_extract_self(obj);
+        if( !OBJ_AT_LEV(obj->olev, obj->ox, obj->oy) &&
+            (mtmp = m_at(obj->olev, obj->ox, obj->oy)) &&
+            mtmp->mundetected &&
+            hides_under(mtmp->data) ) {
+            mtmp->mundetected = 0;
+        }
 	if (update_map) newsym(obj->ox, obj->oy);
 	obfree(obj, (struct obj *) 0);	/* frees contents also */
 }