[MSHARED-188] DefaultMavenFileFilter modifies the MavenProject that comes in through a parameter

o Create a copy of the MavenProject's filters before making modifications

git-svn-id: https://svn.apache.org/repos/asf/maven/shared/trunk@1072594 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/java/org/apache/maven/shared/filtering/DefaultMavenFileFilter.java b/src/main/java/org/apache/maven/shared/filtering/DefaultMavenFileFilter.java
index 77cbea5..2b7cdb8 100644
--- a/src/main/java/org/apache/maven/shared/filtering/DefaultMavenFileFilter.java
+++ b/src/main/java/org/apache/maven/shared/filtering/DefaultMavenFileFilter.java
@@ -211,7 +211,7 @@
         {
             if ( request.isInjectProjectBuildFilters() )
             {
-                List buildFilters = request.getMavenProject().getBuild().getFilters();
+                List buildFilters = new ArrayList( request.getMavenProject().getBuild().getFilters() );
                 buildFilters.removeAll( request.getFileFilters() );
                 
                 loadProperties( filterProperties, buildFilters, baseProps );