Feeds don't use the_content when strlen(content) == 0

[gbhugo]

When a post->content is empty, the feeds use the_excerpt_rss instead of the_content. This can produce problems if plugins add stuff to the content (for example from custom fields), because the post->content check doesn't find any content and uses the_excerpt_rss and so the the_content hook isn't run at all. It might be better to fetch the content with running the hook and check wether the result is empty, instead.

[rob1n]

I don't think this applies anymore. In the code, the_content_rss() uses get_the_content() which should have the get_the_content filter applied to it. Also, the_content_rss is applied. Marking as invalid.