When does a function assigned to the content_filtered_edit_pre filter hook fire?

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I added a function to the filter hook tag 'content_filtered_edit_pre', but it doesn’t seem to fire no matter what I do. I am also aware of 'content_edit_pre', but I am curious as to when this filter hook is called. The following does not result in ‘filtered ‘ being added to the front of my post when I open it in the edit screen, even after another filter has been run: 

function test_of_content_filtered_edit_pre( $content, $post_id ) {
    return "filtered ".$content;
}
add_filter( 'content_filtered_edit_pre', 'test_of_content_filtered_edit_pre', 10, 2 );

The only documentation I can find on the Internet seems to be from the wordpress codex or copies of it.

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1 comment

  1. This is activated within the sanitize_post_field() function:

    Calls ‘edit_{$field}’ and ‘{$field_no_prefix}_edit_pre’ passing $value
    and $post_id if $context is ‘edit’ and field name prefix is ‘post_’.

    So in the case of the post_content_filtered field, the filters are 

    edit_post_content_filtered

    and 

    content_filtered_edit_pre

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