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when does <!--nextpage--> get processed by wordpress filtering. i am adding multiple paged posts in post content on the content_save_pre and this is good for rendering my shortcodes, but <!--nextpage--> doesnt get processed and shows up as an html comment

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As Rarst said, it is parsed on displaying the post, so your content_save_pre should be a good place to insert it. Does it show in the editor if you edit the post again? Can you see a difference in the database between a break entered in the editor and one by your code? Are you sure you used <!--nextpage--> and no spaces in that code? – Jan Fabry Dec 31 '10 at 10:27
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I am not sure what you mean by rendering shortcodes at that stage, they are usually rendered when content is retrieved for display.

nextpage tag is processed in setup_postdata() ( source ), which is called by the_post(). In other words - during Loop.

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I assume he means that he inserts shortcodes and <!--nextpage--> tags in the content_save_pre hook, and the shortcodes get processed like they should, but the page breaks not. – Jan Fabry Dec 31 '10 at 10:28
yes Jan you are correct, @Rarst i will give setup_postdata() a try. thank you. – afj176 Dec 31 '10 at 20:53
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As an update. content_save_pre does process <!--nextpage--> i had the <!--nextpage--> tag inside the shortcode function, once i moved them outside, all was good.

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