Mishandling of escaped quotes in attendee names

[thexeos]

Running this through validator returns mangled output:

BEGIN:VCALENDAR
BEGIN:VEVENT
ATTENDEE;CN="Firstname \"Nickname\" Lastname";PARTSTAT=NEEDS-ACTION:/id/
END:VEVENT
END:VCALENDAR

One result of this is inconsistent display of participant names in Thunderbird:

In the email viewer itself (for emails with ICS attachment), the preview box cuts off attendee name at first escape character (backslash):

After adding event to calendar, the event details window captures text beyond the semicolon:

[dilyanpalauzov]

The correct RFC6868-presentation of the above data is ATTENDEE;CN=Firstname ^'Nickname^' Lastname;PARTSTAT=NEEDS-ACTION:/id/.

The problem report does not describe how to reproduce the problem. In particular it is unclear, whether ical.js has problems parsing ATTENDEE;CN="Firstname \"Nickname\" Lastname";PARTSTAT=NEEDS-ACTION:/id/ as input, or if ical.js returns ATTENDEE;CN="Firstname \"Nickname\" Lastname";PARTSTAT=NEEDS-ACTION:/id/ as output.

As far as the above text is used as input to the validator, the input is wrong.

#507 does improve handling of parsing of parameter values with ^-escapes.

[ray007]

I think I have a related problem: parsing events from ics data I get an ICAL.Event with a color property set to "rgb(81\\,114\\,60)".
Shouldn't there be some decode/encode on parsing/serializing?

[kewisch]

I'm not 100% sure this is a bug or works as intended. What @dilyanpalauzov says seems to suggest everything is working properly? Would appreciate a reopen or new issue in case I missed something.