Node edit form "Disqus comments" checkbox doesn't stick

Currently, the "Disqus comments" checkbox found on node edit forms is broken, for a couple of reasons. First, in node_update(), there is this code, which has inverted logic. It's closing the thread when the new status is ON:

  // Finish the update process.
  if (isset($node->disqus_status) && isset($node->disqus['status']) && $node->disqus_status != $node->disqus['status']) {
    if ($node->disqus_status) {
      disqus_node_delete($node);
    }
    else {
      disqus_node_insert($node);
    }
  }

The easiest thing is to change this to !$node->disqus_status. That fixes the disqus.com side of things.

But that doesn't solve the problem entirely. The next time the user edits the node, the checkbox will get checked again, even though disqus isn't active for the node. That's because disqus_node_delete() removes the record containing the node's disqus_status. Then, the next node_load() defaults it back to "on":

$node->disqus['status'] = isset($status->status) ? (bool)$status->status : TRUE;

So the better thing is to always create or update the entry in the disqus table for the node. See the attached patch.