When editing an event in korganizer, if I was typing digits
to edit a date, rather than using another method (date popup; key_up;
etc.), then the change wouldn't be saved.
I would say that on focus-out or Key_Enter, we want to "commit"
the edited date into the final date as desired by the user, by emitting
dateEntered() and dateChanged(), to match the other edit methods.
The documentation clarifies what I think was the intent of the 3
signals, and the unittest checks that the signals are emitted
accordingly.
BUG: 364200