The "database" property now can hold the final URL of the collection
(aka database) on the WebDAV server which is used for the
source. Setting it skips the entire auto-discovery process, which
makes access quite a bit faster and more reliable.
Because most UIs won't know initially how to find these URLs (listing
them not supported by the core SyncEvolution) and/or won't have the
necessary user dialogs, the property is set automatically after a
successful sync. This avoids the accidental switching between databases
when the user adds or removes databases on the server (which can lead
to different results of the auto discovery).
There's still no guarantee that the database picked by default is the
"right" one. That can only be solved in the UI because servers
typically don't have a "default" or "personal" flag for their
collections.
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