Changed GetUndoString() and GetRedoString() to use nsString *.

editor/txmgr/public/nsITransaction.h

@@ -98,15 +98,15 @@ public:
 
   /**
    * Returns the string to display for the undo menu item.
-   * @param aString will point to string to display.
+   * @param aString will be set to the string to display.
    */
-  NS_IMETHOD GetUndoString(nsString **aString) = 0;
+  NS_IMETHOD GetUndoString(nsString *aString) = 0;
 
   /**
    * Returns the string to display for the redo menu item.
-   * @param aString will point to string to display.
+   * @param aString will be set to the string to display.
    */
-  NS_IMETHOD GetRedoString(nsString **aString) = 0;
+  NS_IMETHOD GetRedoString(nsString *aString) = 0;
 };
 
 #endif // nsITransaction_h__

editor/txmgr/tests/TestTXMgr.cpp

@@ -653,15 +653,17 @@ public:
     return aOutputStream->Write(buf, strlen(buf), &amt);
   }
 
-  NS_IMETHOD GetUndoString(nsString **aString)
+  NS_IMETHOD GetUndoString(nsString *aString)
   {
-    *aString = 0;
+    if (aString)
+      *aString = "";
     return NS_OK;
   }
 
-  NS_IMETHOD GetRedoString(nsString **aString)
+  NS_IMETHOD GetRedoString(nsString *aString)
   {
-    *aString = 0;
+    if (aString)
+      *aString = "";
     return NS_OK;
   }