Get the operation that will next be undone in the given undo context.
Add the specified listener to the list of operation history listeners that are
notified about chang
Remove the specified listener from the list of operation history listeners.
Dispose of the specified context in the history. All operations that have only
the given context wi
Return whether there is a valid redoable operation available in the given
Return whether there is a valid undoable operation available in the given
Set the limit on the undo and redo history for a particular context.
Add the specified operation to the history without executing it. The operation
should have already
Get the operation that will next be redone in the given undo context.
Close the current operation. If the operation has successfully completed, send
listeners a DONE, UN
Get the array of operations in the undo history for the specified undo context.
The operations are
Open this composite operation and consider it an operation that contains other