ok it seem that by svn 8078 it is working again. (maybe 8066 fixed it?)
hi, I just submitted a patch on that ticket which uses is_feed() inside the_content() function to run the the_content_rss hook when appropiate. The issue is appearently the rss2 and atom feeds go through the_content() instead of the_content_rss(). Anyway patch needs testing.
This issue appearently has some history, see
http://trac.ww.wp.xz.cn/ticket/2582 and
http://trac.ww.wp.xz.cn/ticket/6680
I have a tiny patch which should allow the feed (rss2 and atom) to honor <!–more–> when admin/settings/reading are set to full text.
--- wp-includes/post-template.php (revision 7919)
+++ wp-includes/post-template.php (working copy)
@@ -113,6 +113,7 @@
if ( (false !== strpos($post->post_content, '<!--noteaser-->') && ((!$multipage) || ($page==1))) )
$stripteaser = 1;
$teaser = $content[0];
+ if (is_feed()) $more = 0;
if ( ($more) && ($stripteaser) )
$teaser = '';
$output .= $teaser;
