No indication given when 'Content' selected as search root


No results are returned if a root node for the search is not selected when inserting the Search Results macro.
If you select Content, results are returned from the entire site.
But, when inserting the macro, if you select a published document, the macro ui changes to show the node name.
When you select the Content node, no indication is given by the ui that it has been selected, and a Search Result (inserted macro) with no node selected looks just like a Search Result macro with all nodes selected.
This is from the TinyMCE content editor and macro insertion tool. In the templates or in the result Html you can see that umb_searchstartnodeid="-1" is set when you select 'Content', but omitted if nothing was selected.