In a the Preferences window there is a Cancel button and cancel, in my opinion, means to discard the changes that have been made. Would'nt it be better to use a Close button, like in every XFCE settings window?
Fixed with revision 21185. 2006-04-23 Benedikt Meurer <benny@xfce.org> * terminal/terminal-preferences-dialog.c (terminal_preferences_dialog_init): Use "Close" label instead of "Cancel". Bug #1714.