Hello, lately I can't successfully vdirsyncer sync my calendars because of a
database is locked error. Synchronization works fine with android's davdroid which talks with the same server.

Your vdirsyncer version: 0.16.4
If applicable, which server software (and which version) you're using: Nextcloud 13
Your Python version: 3.6.4
Your operating system: Arch linux
Relevant debug outpu

Some first impressions:

• There is always a short flash of the popover being somewhere else before the popover is positioned correctly. Any way we can prevent this?
• The title field needs to be focused when the popup appears so you can directly start typing
• T

would be a nice feature...

see tine20/vobject@24f9362

This would be especially useful for calendar.

When navigating thru multiple months very fast, it doesn't cancel requests at the moment but loads all the months you visited.

When opening an event with no description, the description field displays the description of the last selected event and the following error appears in the console:

Gtk-CRITICAL **: 15:11:18.767: gtk_text_buffer_set_text: assertion 'text != NULL' failed

The code in event-panel.c should check if the description retrieved from the icalcomponent is NULL and if so, clear the text