When I type some note to a particular day in xfcalendar,
there are five buttons (namely: left arrow (prev day),
home (today), right arrow (next day), close inside the
window, and the window manager's close button), and their
shortcut keys, which, if accidentally pressed, the changes
I typed get lost without a warning or confirmation and
without the possibitily to bring them back.

I guess all these actions should take a confirmation
offering the usual three possibilities (save changes,
drop changes, cancel action).

Maybe another possibility would be to always auto-save
whatever I type to a day, remove the 'save' icon, and
save the changes whenever I leave a day in any of the
above mentioned ways.