Please describe the problem:
I use DAViCal aka rscds for handling CalDAV calendars. However, newest versions now provide ics with MIME type "text/calendar; charset=utf-8", which by itself is valid MIME. However e-d-s function can't use it in current state and therefore file is silently dropped, resulting in enabled, but empty calendar for user. Code in question resists in calendar/backends/caldav, file e-cal-backend-caldav.c, line #1022.

Code is:
        if (hdr == NULL || g_ascii_strcasecmp (hdr, "text/calendar")) {
                ...
                ...
        }

but it must be changed to:
if (hdr == NULL || g_ascii_strncasecmp (hdr, "text/calendar", 13)) {
                ...
                ...
        }

As it gets first 13 chars, which is "text/calendar" length.

Steps to reproduce:
1. Open Evolution
2. Choose Calendars, New=> Calendar, CalDAV, enter details (server should be newest DAViCal, rscds.sourceforge.net), press OK. Connection is made.
3. Enter event to CalDAV calendar, which gets published
4. Delete calendar from sidebar and re-add it trough New => Calendar

Actual results:
Events don't show up, however Apache log shows that ics files gets downloaded.

Expected results:
Events entered before shows up as they downloaded from CalDAV server.

Does this happen every time?
Yes

Other information:
This is _very_ easy fix. Maybe discussion is needed is this proper way to handle such MIME messages.