calendar: switching between months for end date of all-day event fails
The calendar widget for selecting a day contains two small arrows in the top left and top right corners. These arrows can be used for switching to the previous or next month.
These arrows fail to work (i.e. the month is not changed), if the all of the following conditions are met:
- the event is an all-day event (not hours and minutes)
- the end date is selected (not the start date)
In this case, the month just stays unchanged.
See the following video for a visualization of the problem.