Fix: monster casting summon minion against another monster.

If a monster cast the spell 'summon minion' against another monster,
the spell would still target the player. The function summon_minion()
currently isn't setup to handle a target other than the player, so
suppress this scenario from occuring for now.

Author: k21971

doc/evilhack-changelog.md

@@ -3378,4 +3378,5 @@ The following changes to date are:
 - Proper encyclopedia entries/lookup for the artifact rings
 - Fix: Convicts felt guilty when encountering the guard from a gold vault
 - Hobbit pickpockets are always hostile
+- Fix: monster casting summon minion against another monster
 

src/mcastu.c

@@ -2364,6 +2364,12 @@ int spellnum;
             return;
         }
 
+        /* monster vs monster is suppressed, as summon_minion()
+           currently does not support anything but the player
+           as a target */
+        if (!yours)
+            return;
+
         aligntype = yours ? u.ualign.type : mon_aligntyp(mattk);
         minion = summon_minion(aligntype, FALSE);
         if (minion && canspotmon(minion))
@@ -2620,8 +2626,7 @@ int spellnum;
             shieldeff(mtmp->mx, mtmp->my);
             dmg = (dmg + 1) / 2;
         }
-        /* not canseemon; if you can't see it you don't know it was wounded */
-        if (yours) {
+        if (yours || canseemon(mtmp)) {
             if (dmg <= 5)
                 pline("%s looks itchy!", Monnam(mtmp));
             else if (dmg <= 10)