[Akonadi] [Bug 368102] New: Akonadi does not fetch all calendar items from nextcloud instance

[via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=368102

            Bug ID: 368102
           Summary: Akonadi does not fetch all calendar items from
                    nextcloud instance
           Product: Akonadi
           Version: unspecified
          Platform: Archlinux Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: DAV Resource
          Assignee: kdepim-bugs at kde.org
          Reporter: rndbit at nm.ru

Sometimes it fetches few events, sometimes none. Log from akonadiconsole:

> akonadi_davgroupware_resource_10 (0x28545a0) 47 { Command: "FetchCollections" Collections: "UID 21" Depth: "0" Resource: "akonadi_davgroupware_resource_10" Mimetypes: "()" Ancestors Depth: "2" Ancestors Attributes: "QSet()" Enabled: "false" Sync: "true" Display: "false" Index: "false" Status: "false" }
akonadi_davgroupware_resource_10 (0x28545a0) 47 { Response: "FetchCollections"
Error Code: "0" Error Msg: "" ID: "21" Name:
"https://server.com/remote.php/caldav/calendars/bit/default/" Parent ID: "19"
Remote ID: "https://server.com/remote.php/caldav/calendars/bit/default/" Remote
Revision: "" Resource: "akonadi_davgroupware_resource_10" Mimetypes:
"(application/x-vnd.akonadi.calendar.todo,
application/x-vnd.akonadi.calendar.event, inode/directory)" Statistics: {
Count: "-1" Unseen: "-1" Size: "-1" } Search Query: "" Search Collections:
"QVector()" Cache Policy: { Inherit: "true" Interval: "60" Cache Timeout: "-1"
Sync on Demand: "false" Local Parts: "(ALL)" } Ancestors: { { ID: "19" Remote
ID: "akonadi_davgroupware_resource_10" Name: "akonadi_davgroupware_resource_10"
Attributes: "QMap()" } { ID: "0" Remote ID: "" Name: "" Attributes: "QMap()" }
} Attributes: "QMap((AccessRights, a)(ENTITYDISPLAY, ("default" "" ""
()))(ctag, http://sabre.io/ns/sync/1)(davprotocol, 0))" Display: "Undefined"
Sync: "Undefined" Index: "Undefined" Enabled: "true" Virtual: "false"
Referenced: "false" }
akonadi_davgroupware_resource_10 (0x28545a0) 47 { Response: "FetchCollections"
Error Code: "0" Error Msg: "" ID: "-1" Name: "" Parent ID: "-1" Remote ID: ""
Remote Revision: "" Resource: "" Mimetypes: "()" Statistics: { Count: "-1"
Unseen: "-1" Size: "-1" } Search Query: "" Search Collections: "QVector()"
Cache Policy: { Inherit: "true" Interval: "-1" Cache Timeout: "-1" Sync on
Demand: "false" Local Parts: "()" } Ancestors: { } Attributes: "QMap()"
Display: "Undefined" Sync: "Undefined" Index: "Undefined" Enabled: "true"
Virtual: "false" Referenced: "false" }
> akonadi_davgroupware_resource_10 (0x28545a0) 48 { Command: "FetchCollections" Collections: "UID 21" Depth: "0" Resource: "" Mimetypes: "()" Ancestors Depth: "2" Ancestors Attributes: "QSet()" Enabled: "true" Sync: "false" Display: "false" Index: "false" Status: "false" }
akonadi_davgroupware_resource_10 (0x28545a0) 48 { Response: "FetchCollections"
Error Code: "0" Error Msg: "" ID: "21" Name:
"https://server.com/remote.php/caldav/calendars/bit/default/" Parent ID: "19"
Remote ID: "https://server.com/remote.php/caldav/calendars/bit/default/" Remote
Revision: "" Resource: "akonadi_davgroupware_resource_10" Mimetypes:
"(application/x-vnd.akonadi.calendar.todo,
application/x-vnd.akonadi.calendar.event, inode/directory)" Statistics: {
Count: "-1" Unseen: "-1" Size: "-1" } Search Query: "" Search Collections:
"QVector()" Cache Policy: { Inherit: "true" Interval: "60" Cache Timeout: "-1"
Sync on Demand: "false" Local Parts: "(ALL)" } Ancestors: { { ID: "19" Remote
ID: "akonadi_davgroupware_resource_10" Name: "akonadi_davgroupware_resource_10"
Attributes: "QMap()" } { ID: "0" Remote ID: "" Name: "" Attributes: "QMap()" }
} Attributes: "QMap((AccessRights, a)(ENTITYDISPLAY, ("default" "" ""
()))(ctag, http://sabre.io/ns/sync/1)(davprotocol, 0))" Display: "Undefined"
Sync: "Undefined" Index: "Undefined" Enabled: "true" Virtual: "false"
Referenced: "false" }
akonadi_davgroupware_resource_10 (0x28545a0) 48 { Response: "FetchCollections"
Error Code: "0" Error Msg: "" ID: "-1" Name: "" Parent ID: "-1" Remote ID: ""
Remote Revision: "" Resource: "" Mimetypes: "()" Statistics: { Count: "-1"
Unseen: "-1" Size: "-1" } Search Query: "" Search Collections: "QVector()"
Cache Policy: { Inherit: "true" Interval: "-1" Cache Timeout: "-1" Sync on
Demand: "false" Local Parts: "()" } Ancestors: { } Attributes: "QMap()"
Display: "Undefined" Sync: "Undefined" Index: "Undefined" Enabled: "true"
Virtual: "false" Referenced: "false" }

Lines prepended with ">" were in red so i guess they must be errors.

Reproducible: Always

Steps to Reproduce:
1. In akonadiconsole add "Dav groupware resource"
2. Point said resource to your nextCloud (ownCloud) instance which has calendar
app enabled and contains some events. 
3. Uncheck "limit caldav retrieval time range"
3. Let it synchronize.

Actual Results:  
Only 0-3 events are fetched. Successfully fetched event count is different if
resource is removed and re-added. It never fetches more than few events out of
tens of events i have.

It does properly fetch contact birthdays.
Sometimes it also fetches contacts (CardDav), sometimes it does not fetch any.

Expected Results:  
It should fetch events of entire calendar.

Version is 16.08 (it is not in version selector for some reason)

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