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= Analysis =

== Overview ==
This task is related to the !UndoManager. The change manager is like the undo-manager, but allows skipping, unskipping etc. Currently we have an !UndoManger which will later become a change manager with the additional features described bellow.

skip change, unskip change, undo change,  

== Task requirements ==
 * review code in [source:trunk/sophie2-platform/modules/org.sophie2.core/src/main/java/org/sophie2/core/prolib/util/UndoManager.java !UndoManager] that represents the current undo manager.
 * besides undo change and redo change the !ChangeManager should also be capable of doing the following:
  * skip a change - the change will be skipped and the next in turn will be available if such exists. Unmanaged changes should all be skipped by default (see [wiki:PRO_CHANGE_PRIMITIVES_R0]). Other changes may be skipped depending on certain situations.
  * unskip a change - will provide the opportunity to revert the skipping of a change. This should be possible only if a skip of the change had been done.
  * undo/redo - the undo/redo mechanism should behave in a generally accepted manner as in most applications nowadays.
  * '''Important:'''
   * skip/unskip and undo/redo are all going to be defined as changes. 
   * undo/redo should be possible to be skipped and unskipped.
   * skip/unskip should be possible to be undone and redone.
   

== Task result ==

== Implementation idea ==

== Related ==

[wiki:PRO_CHANGE_PRIMITIVES_R0] [[BR]]
[wiki:PRO_CHANGE_TRANSACTION_SAFETY_R0] [[BR]]
[wiki:PRO_CHANGE_COMPOSING_R0] [[BR]]
[wiki:PRO_CHANGE_MANAGER_R0] [[BR]]

== How to demo ==

= Design =

= Implementation =

= Testing =

= Comments =