There are matching tpl.php files in date_api/theme, and template_preprocess_date_vcalendar is still being called, but missing some variables.
Notice: Undefined index: events in template_preprocess_date_vcalendar() (line 233 of /www/var/d7/sites/all/modules/date/date_api/theme/theme.inc).
Warning: Invalid argument supplied for foreach() in template_preprocess_date_vcalendar() (line 236 of /www/var/d7/sites/all/modules/date/date_api/theme/theme.inc).
Also, I followed the instructions, and it doesn't actually seem to work. The results of the tpl.php are just printed to the screen, not as a file.
Comments
Comment #1
tim.plunkettIn date_ical_views_plugins the plugins are set to use differently named theme functions than the plugin name.
Comment #2
tim.plunkettOops, ignore the middle hunk, that was just me debugging.
Comment #3
tim.plunkettFixed.
http://drupalcode.org/project/date_ical.git/commit/edbed84