From f2cc5ee775d74e9c8ca2db6a091a735fc0d72933 Mon Sep 17 00:00:00 2001
From: Eugene Yokota <eed3si9n@gmail.com>
Date: Thu, 18 May 2017 00:36:24 -0400
Subject: [PATCH] convert log4j async LogEvent to an immutable one

This fixes the buffered log not showing up for tests.

Ref sbt/sbt#3198
---
 .../src/main/scala/sbt/internal/util/BufferedLogger.scala       | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/internal/util-logging/src/main/scala/sbt/internal/util/BufferedLogger.scala b/internal/util-logging/src/main/scala/sbt/internal/util/BufferedLogger.scala
index d3b6972bc..a8399e2b6 100644
--- a/internal/util-logging/src/main/scala/sbt/internal/util/BufferedLogger.scala
+++ b/internal/util-logging/src/main/scala/sbt/internal/util/BufferedLogger.scala
@@ -38,7 +38,7 @@ class BufferedAppender private[BufferedAppender] (name: String, delegate: Append
   def append(event: XLogEvent): Unit =
     {
       if (recording) {
-        buffer += event
+        buffer += event.toImmutable
       } else delegate.append(event)
     }