Calendar: Events with a duration of 0 minutes are not displayed correctly

[davidbo]

1. Create an event with the same start and stop time in iCal on Mac OS X on a calender published to a webdav-server 2. Subscribe to that calender from Mulberry (Windows version in my case) 3. Look at the event created in (1). The event begins at the correct time but ends at midnight.

When you fix this, please make sure that you use some minimal height larger than 0/1 px for events lasting 0 minutes (Sunbird doesn't which makes it impossible to select etc 0 minutes events). Otherwise you are gonna have lot of annoying GUI-issues.