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Chrome can emulate mobile devices for debugging! Nice.
Now when you click the + icon in this outline, you will create a calendar structure of nodes of type idea. Each one of these items appears in your RSS feed because it has an isFeedItem attribute, which is put there when you hit the + icon.
However these nodes are treated differently when we create the RSS guid for it. We don't generate a path to the node, we generate a path to the headline 2 levels in from the summit that contains it, a node that represents a day in the calendar. Then we add a #name value at the end of the URL to construct a guid which is both a permalink and unique. The guid is based on the created att on the headline, so unless you create two headlines in the same second, each will have a unique address. So be careful when creating these items not to create a bunch of them by wailing on the + icon. Do it more slowly.
If you have it set so that new items are comments, that will be respected as before, so until you uncomment the node it won't appear in the feed. This option is set in the Insert tab in the global settings dialog.