From e801c581d34208bf517b2fe890b5539deb03a2cd Mon Sep 17 00:00:00 2001
From: toasterbabe <rollerorbital@gmail.com>
Date: Tue, 27 Sep 2016 11:50:48 +0100
Subject: [PATCH] Fixed off-by-one error with the relationship between
 FF_ANIMATE's var1/number of frames, FF_MIDDLESTARTCHANCE, and P_RandomKey.

---
 src/p_mobj.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/p_mobj.c b/src/p_mobj.c
index 81551c6a03..44a701ee9b 100644
--- a/src/p_mobj.c
+++ b/src/p_mobj.c
@@ -622,7 +622,7 @@ boolean P_SetPlayerMobjState(mobj_t *mobj, statenum_t state)
 			mobj->sprite = st->sprite;
 			mobj->frame = st->frame;
 			if ((st->frame & (FF_ANIMATE|FF_MIDDLESTARTCHANCE)) == (FF_ANIMATE|FF_MIDDLESTARTCHANCE))
-				mobj->frame += P_RandomKey(st->var1);
+				mobj->frame += P_RandomKey(st->var1+1);
 		}
 
 		// Modified handling.
@@ -737,7 +737,7 @@ boolean P_SetMobjState(mobj_t *mobj, statenum_t state)
 			mobj->sprite = st->sprite;
 			mobj->frame = st->frame;
 			if ((st->frame & (FF_ANIMATE|FF_MIDDLESTARTCHANCE)) == (FF_ANIMATE|FF_MIDDLESTARTCHANCE))
-				mobj->frame += P_RandomKey(st->var1);
+				mobj->frame += P_RandomKey(st->var1+1);
 		}
 
 		// Modified handling.
-- 
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