vision thing

<Someone> reported: You kill it! A potion of invisibility shatters!
Change the rule in hero_breaks() to avoid giving info for things out of
sight, except when from_invent is set, to preserve desired behavior.

doc/fixes34.4

@@ -97,6 +97,7 @@ only prefix shopkeeper names with "Mr." or "Ms." when not a personal name
 green slime should not affect noncorporeal monsters
 land mine explosion will destroy a drawbridge at same location
 avoid some more buffer overflows in query buffers containing object names
+avoid giving extra information about things that break out of sight
 
 
 Platform- and/or Interface-Specific Fixes

src/dothrow.c

@@ -1538,7 +1538,7 @@ struct obj *obj;
 xchar x, y;		/* object location (ox, oy may not be right) */
 boolean from_invent;	/* thrown or dropped by player; maybe on shop bill */
 {
-	boolean in_view = !Blind;
+	boolean in_view = Blind ? FALSE : (from_invent || cansee(x, y));
 	if (!breaktest(obj)) return 0;
 	breakmsg(obj, in_view);
 	breakobj(obj, x, y, TRUE, from_invent);