From 2546f39568f33f63e60abb87536c48a19d9fe184 Mon Sep 17 00:00:00 2001
From: Raymond Hill <rhill@raymondhill.net>
Date: Mon, 19 Oct 2020 12:01:55 -0400
Subject: [PATCH] Avoid trapping already trapped properties

Related feedback:
- https://github.com/uBlockOrigin/uBlock-issues/issues/156#issuecomment-712249945

When the client code assigned a variable to itself, this
would cause the scriptlet to try to re-trap already
trapped properties.
---
 assets/resources/scriptlets.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/assets/resources/scriptlets.js b/assets/resources/scriptlets.js
index 78ae17cd7..7fc87fac3 100644
--- a/assets/resources/scriptlets.js
+++ b/assets/resources/scriptlets.js
@@ -808,6 +808,7 @@
                 return this.v;
             },
             setter: function(a) {
+                if ( a === this.v ) { return; }
                 this.v = a;
                 if ( a instanceof Object ) {
                     trapChain(a, chain);