8176458: Revise default document styling

Reviewed-by: prr, serb, mschoene
diff --git a/jdk/src/share/classes/javax/swing/text/DefaultEditorKit.java b/jdk/src/share/classes/javax/swing/text/DefaultEditorKit.java
index 2af3c96..bc6269d 100644
--- a/jdk/src/share/classes/javax/swing/text/DefaultEditorKit.java
+++ b/jdk/src/share/classes/javax/swing/text/DefaultEditorKit.java
@@ -109,7 +109,7 @@
      * @return the command list
      */
     public Action[] getActions() {
-        return defaultActions;
+        return defaultActions.clone();
     }
 
     /**