Index: C:/test/working_classlib/modules/swing/src/main/java/common/javax/swing/undo/UndoManager.java =================================================================== --- C:/test/working_classlib/modules/swing/src/main/java/common/javax/swing/undo/UndoManager.java (revision 557607) +++ C:/test/working_classlib/modules/swing/src/main/java/common/javax/swing/undo/UndoManager.java (working copy) @@ -43,6 +43,7 @@ public UndoManager() { indexOfNextAdd = 0; limit = DEFAULT_LIMIT; + edits.ensureCapacity(limit); }