RFC references RFC 6578:

 - 3.1: The client can then present that same token back to the server at some later time, and the server will return
        only those items that are new, have changed, or were deleted since that token was generated.


Step 1) Put two cards on the server
[2024-03-31 09:18:04]: [2 NFO] "PUT /SOGo/dav/mikey@dev.mike2k.de/Contacts/personal/sabre-vobject-dfb74b0d-5733-4635-bd4a-99d1c7eedf06.vcf HTTP/1.1" 201
[2024-03-31 09:18:04]: [2 NFO] "PUT /SOGo/dav/mikey@dev.mike2k.de/Contacts/personal/sabre-vobject-c682554f-32ee-4245-89e6-14ba6d8e6a71.vcf HTTP/1.1" 201




Step 2) Perform initial sync-collection with empty sync-token (full sync) - Result is boths cards just added, EXPECTED

[2024-03-31 09:18:04]: [2 NFO] "REPORT /SOGo/dav/mikey@dev.mike2k.de/Contacts/personal/ HTTP/1.1" 207  SYNC SYNCTOKEN=           => SYNCTOKEN=1711876683, [sabre-vobject-c682554f-32ee-4245-89e6-14ba6d8e6a71.vcf, sabre-vobject-dfb74b0d-5733-4635-bd4a-99d1c7eedf06.vcf]
[2024-03-31 09:18:04]: [2 NFO] "REPORT /SOGo/dav/mikey@dev.mike2k.de/Contacts/personal/ HTTP/1.1" 207  MULTIGET




Step 3) Perform incremental sync-collection with the sync-token just retrieved from the server. Result is again both
cards, NOT EXPECTED. Expectation: no changes reported.

[2024-03-31 09:18:04]: [2 NFO] "REPORT /SOGo/dav/mikey@dev.mike2k.de/Contacts/personal/ HTTP/1.1" 207  SYNC SYNCTOKEN=1711876683 => SYNCTOKEN=1711876683, [sabre-vobject-c682554f-32ee-4245-89e6-14ba6d8e6a71.vcf, sabre-vobject-dfb74b0d-5733-4635-bd4a-99d1c7eedf06.vcf]
[2024-03-31 09:18:04]: [2 NFO] "REPORT /SOGo/dav/mikey@dev.mike2k.de/Contacts/personal/ HTTP/1.1" 207  MULTIGET


Step 4) Delete one of the cards, add a new one

[2024-03-31 09:18:04]: [2 NFO] "DELETE /SOGo/dav/mikey%40dev.mike2k.de/Contacts/personal/sabre-vobject-dfb74b0d-5733-4635-bd4a-99d1c7eedf06.vcf HTTP/1.1" 204
[2024-03-31 09:18:05]: [2 NFO] "PUT /SOGo/dav/mikey@dev.mike2k.de/Contacts/personal/sabre-vobject-1b3a9af1-9556-4c31-b77a-15618166b17f.vcf HTTP/1.1" 201



Step 5) Perform incremental sync-collection with the sync-token retrieved earlier from the server. SOGo correctly
reports the deleted card, and the newly added card. But it also reports the unchanged card again.

[2024-03-31 09:18:05]: [2 NFO] "REPORT /SOGo/dav/mikey@dev.mike2k.de/Contacts/personal/ HTTP/1.1" 207  SYNC SYNCTOKEN=1711876683 => SYNCTOKEN=1711876684, [sabre-vobject-1b3a9af1-9556-4c31-b77a-15618166b17f.vcf, sabre-vobject-c682554f-32ee-4245-89e6-14ba6d8e6a71.vcf], DEL: [sabre-vobject-dfb74b0d-5733-4635-bd4a-99d1c7eedf06.vcf]
[2024-03-31 09:18:05]: [2 NFO] "REPORT /SOGo/dav/mikey@dev.mike2k.de/Contacts/personal/ HTTP/1.1" 207  MULTIGET