8176450: Revise default document styling

Reviewed-by: prr, serb, mschoene
diff --git a/src/java.desktop/share/classes/javax/swing/text/DefaultEditorKit.java b/src/java.desktop/share/classes/javax/swing/text/DefaultEditorKit.java
index 3e10861..c724ae1 100644
--- a/src/java.desktop/share/classes/javax/swing/text/DefaultEditorKit.java
+++ b/src/java.desktop/share/classes/javax/swing/text/DefaultEditorKit.java
@@ -110,7 +110,7 @@
      * @return the command list
      */
     public Action[] getActions() {
-        return defaultActions;
+        return defaultActions.clone();
     }
 
     /**