From e832cee1e60c3e615d38711a87737691245df35d Mon Sep 17 00:00:00 2001
From: Jude Melton-Houghton <jwmhjwmh@gmail.com>
Date: Fri, 30 Sep 2022 06:31:24 -0400
Subject: [PATCH] Avert collision static detection rounding error (#12822)

---
 src/collision.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/collision.cpp b/src/collision.cpp
index 1ef094d29..e363673fe 100644
--- a/src/collision.cpp
+++ b/src/collision.cpp
@@ -250,11 +250,12 @@ collisionMoveResult collisionMoveSimple(Environment *env, IGameDef *gamedef,
 		time_notification_done = false;
 	}
 
-	v3f newpos_f = *pos_f + (*speed_f + accel_f * 0.5f * dtime) * dtime;
+	v3f dpos_f = (*speed_f + accel_f * 0.5f * dtime) * dtime;
+	v3f newpos_f = *pos_f + dpos_f;
 	*speed_f += accel_f * dtime;
 
 	// If the object is static, there are no collisions
-	if (newpos_f == *pos_f)
+	if (dpos_f == v3f())
 		return result;
 
 	// Limit speed for avoiding hangs