fix 27b5d1952926a7bf7cd1f1d35305c7dde1c4a195 "Thread.critical does not exist in ruby...
[booh] / lib / booh / UndoHandler.rb
2005-07-14 gcmultiple elements selection and autoscroll in there...
2005-05-29 gc*** empty log message ***
2005-04-12 gcdisplay undo/redo actions in statusbar
2005-04-11 gcundo/redo support