From cdbc08b9119b062ee9db2967bf19f7be95444756 Mon Sep 17 00:00:00 2001
From: Manish Goregaokar <manishsmail@gmail.com>
Date: Fri, 5 Apr 2019 13:12:19 -0700
Subject: [PATCH] Set transform.inverse.inverse == transform

https://github.com/immersive-web/webxr/issues/576
---
 components/script/dom/xrrigidtransform.rs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/components/script/dom/xrrigidtransform.rs b/components/script/dom/xrrigidtransform.rs
index 030905d84fa..969ec839292 100644
--- a/components/script/dom/xrrigidtransform.rs
+++ b/components/script/dom/xrrigidtransform.rs
@@ -100,8 +100,11 @@ impl XRRigidTransformMethods for XRRigidTransform {
     }
     // https://immersive-web.github.io/webxr/#dom-xrrigidtransform-inverse
     fn Inverse(&self) -> DomRoot<XRRigidTransform> {
-        self.inverse
-            .or_init(|| XRRigidTransform::new(&self.global(), self.transform.inverse()))
+        self.inverse.or_init(|| {
+            let transform = XRRigidTransform::new(&self.global(), self.transform.inverse());
+            transform.inverse.set(Some(self));
+            transform
+        })
     }
     // https://immersive-web.github.io/webxr/#dom-xrrigidtransform-matrix
     #[allow(unsafe_code)]