From e290bc6fd073bba60b0b8e9b1428d75166f05790 Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <c.oelckers@zdoom.fake>
Date: Fri, 4 Mar 2016 15:24:13 +0100
Subject: [PATCH] - fixed: In Hexen, ThrustThing can not be triggered from the
 backside of a line.

This gets only activated when the HEXENHACK flag is set. For ZDoom maps there is a specific line flag to handle this condition explicitly.
---
 src/p_lnspec.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/p_lnspec.cpp b/src/p_lnspec.cpp
index 5c1693ac9..857c8ef87 100644
--- a/src/p_lnspec.cpp
+++ b/src/p_lnspec.cpp
@@ -1115,6 +1115,10 @@ FUNC(LS_ThrustThing)
 	}
 	else if (it)
 	{
+		if (level.flags2 & LEVEL2_HEXENHACK && backSide)
+		{
+			return false;
+		}
 		ThrustThingHelper (it, BYTEANGLE(arg0), arg1, arg2);
 		return true;
 	}