From 47a5caef545581d7ee56692382ed556161dc257b Mon Sep 17 00:00:00 2001
From: Raymond Hill <rhill@raymondhill.net>
Date: Sun, 7 Jul 2019 06:57:30 -0400
Subject: [PATCH] Fix last newline not being automatically appended

Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/657
---
 src/js/dyna-rules.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/js/dyna-rules.js b/src/js/dyna-rules.js
index 92217ae78..839a9b4da 100644
--- a/src/js/dyna-rules.js
+++ b/src/js/dyna-rules.js
@@ -152,8 +152,10 @@ const rulesToDoc = function(clearHistory) {
         // https://github.com/uBlockOrigin/uBlock-issues/issues/593
         //   Ensure the text content always ends with an empty line to avoid
         //   spurious diff entries.
-        let beforeText = doc.getValue().trim();
-        if ( beforeText !== '' ) { beforeText += '\n'; }
+        // https://github.com/uBlockOrigin/uBlock-issues/issues/657
+        //   Diff against unmodified beforeText so that the last newline can
+        //   be reported in the diff and thus appended if needed.
+        let beforeText = doc.getValue();
         let afterText = rules.join('\n').trim();
         if ( afterText !== '' ) { afterText += '\n'; }
         const diffs = differ.diff_main(beforeText, afterText);