(ddd.info)Customizing Undo

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3.6.3 Customizing Undo
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DDD Undo can be customized in various ways.

   To set a maximum size for the undo buffer, set `Edit => Preferences
=> General => Undo Buffer Size'.

   This is related to the `maxUndoSize' resource:

 -- Resource: maxUndoSize (class MaxUndoSize)
     The maximum memory usage (in bytes) of the undo buffer.  Useful for
     limiting DDD memory usage.  A negative value means to place no
     limit.  Default is `2000000', or 2000 kBytes.

   You can also limit the number of entries in the undo buffer,
regardless of size (Note: Customizing):

 -- Resource: maxUndoDepth (class MaxUndoDepth)
     The maximum number of entries in the undo buffer.  This limits the
     number of actions that can be undone, and the number of states that
     can be shown in historic mode.  Useful for limiting DDD memory
     usage.  A negative value (default) means to place no limit.

   To clear the undo buffer at any time, thus reducing memory usage, use
`Edit => Preferences => General => Clear Undo Buffer'