Property parameters on calendar and address events are discarded

[chrysn]

With DAVx5/4.2.3.4-ose (as installed through F-Droid, used on LineageOS 14.1) I've observed that property parameters present in the original vCalendar or vCard file are not present after the file was modified through DAVx5.

Concrete examples are

-EMAIL;TYPE=WORK;X-EVOLUTION-UI-SLOT=1:[email protected]
+EMAIL;TYPE=work:[email protected]

in vCard files, and

-TRIGGER;RELATED=START:-PT10M
+TRIGGER:-PT10M

in vCalendar files.

This appears to only affect properties that are recognized by DAVx5 -- lines such as

X-JABBER;X-EVOLUTION-UI-SLOT=1:xmpp:[email protected]

are unaffected.

These concrete parameters may not be particularly valuable, but I'd have a hard time figuring out the precise conditions on which parameters are affected, and generally these should be preserved.

Is this a known issue, could it be fixed easily, and if so, where?

I've considered whether the server could assist in working around this (I'm using radicale 3.1.8 as a server, but that should not matter), but it simply does not have enough information to distinguish between a client removing a parameter intentionally and removing it because it does not know it.