Avoid certain textchanges type to be inserted in undohistoy

Hi,
is it possible to avoid certain textchange types e.g. to be inserted in the undo stack of editors document history? I dont't want the user to undo some programmatic textchanges i've made on the document.

Maybe it is possible to manipulate the textchange in the UndoHistory_UndoRedoRequested eventhandler?

Thanks in advance.