half-physical-damage from gas spore explosion should only affect you

- <Someone> noticed the fix for applying half physical damage to gas spore
explosions affected damage to all monsters, not just you

doc/fixes34.1

@@ -21,6 +21,7 @@ fix iron ball cases that could put the chain in solid rock
 discovering a mimic on a closed door location should not unblock the location
 don't drop corpse when a monster kills another monster on an inaccessible
 	location (i.e. behave like xkilled behaves)
+half-physical-damage from gas spore explosion should only affect you
 
 
 Platform- and/or Interface-Specific Fixes

src/explode.c

@@ -314,7 +314,8 @@ int expltype;
 		if (Invulnerable) {
 		    damu = 0;
 		    You("are unharmed!");
-		}
+		} else if (Half_physical_damage && adtyp == AD_PHYS)
+		    damu = (damu+1) / 2;
 		if (adtyp == AD_FIRE) (void) burnarmor(&youmonst);
 		destroy_item(SCROLL_CLASS, (int) adtyp);
 		destroy_item(SPBOOK_CLASS, (int) adtyp);

src/mon.c

@@ -1419,13 +1419,13 @@ boolean was_swallowed;			/* digestion */
 	    	else if(mdat->mattk[i].damd)
 	    	    tmp = d((int)mdat->mlevel+1, (int)mdat->mattk[i].damd);
 	    	else tmp = 0;
-		if (Half_physical_damage) tmp = (tmp+1) / 2;
 		if (was_swallowed && magr) {
 		    if (magr == &youmonst) {
 			There("is an explosion in your %s!",
 			      body_part(STOMACH));
 			Sprintf(killer_buf, "%s explosion",
 				s_suffix(mdat->mname));
+			if (Half_physical_damage) tmp = (tmp+1) / 2;
 			losehp(tmp, killer_buf, KILLED_BY_AN);
 		    } else {
 			if (flags.soundok) You_hear("an explosion.");