is there a way to reset the undo history?

I couldn't see a way of resetting the undo states with out basically reloading the entire editor .. which I wanted to avoid. Why reload when you can reuse?

To get around the issue I had to add a newfunction to fckundo.js

FCKUndo.resetUndoState = function()
{
   //simple reset of the undo history
   this.SavedData = new Array() ;
   this.CurrentIndex = -1 ;
   this.TypesCount = 0 ;
   this.Changed = false ;
   this.MaxTypes = 25 ;
   this.Typing = false ;
   this.SaveLocked = false ;
   FCK.Events.FireEvent( "OnSelectionChange" ) ; // this updates the undo and redo toolbar status
}

calling FCKUndo.resetUndoState() now rests the undo history back to zero. So it does what i wanted ... but I really *really* wanted to avoid maintaining my own functions in the main code. Is there any chance of getting the function added to the main code base?

To make this a really useful solution .. I had to modify fck.js to add a new function ..

   ResetUndoState : function()
   {
      FCKUndo.resetUndoState() ;
   },

You can then call the reset using something like oEditor.ResetUndoState();
I also simplified the function in FCKundo.js

FCKUndo.resetUndoState = function()
{
   //simple reset of the undo history
   this.SavedData = new Array() ;
   this.CurrentIndex = -1 ;
   this.TypesCount = 0 ;
   this.Changed = false ;
   this.Typing = false ;
   this.SaveLocked = false ;
}

You need to call the FCK.Events.FireEvent( "OnSelectionChange" ) event if you use ResetUndoState inside a plugin. It's not needed if you call it through your instance reference (EG oEditor.ResetUndoState())

Anyways .. I post this in case anyone ever needs it in the future