From b63ced24d415827342ac14b3924e68054851f398 Mon Sep 17 00:00:00 2001
From: Raymond Hill <rhill@raymondhill.net>
Date: Sun, 12 Mar 2023 09:45:33 -0400
Subject: [PATCH] Fix broken filter parsing when prepended with spaces

Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/2540
---
 src/js/static-filtering-parser.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/js/static-filtering-parser.js b/src/js/static-filtering-parser.js
index 0b328328f..a473c088c 100644
--- a/src/js/static-filtering-parser.js
+++ b/src/js/static-filtering-parser.js
@@ -1096,7 +1096,7 @@ export class AstFilterParser {
         let anchorBeg = this.indexOfNetAnchor(parentStr, patternBeg);
         if ( anchorBeg === -1 ) { return 0; }
         anchorBeg += parentBeg;
-        if ( anchorBeg !== parentStr.length ) {
+        if ( anchorBeg !== parentEnd ) {
             tail = this.allocTypedNode(
                 NODE_TYPE_NET_OPTIONS_ANCHOR,
                 anchorBeg,