Retrieve entire favorites hierarchy without recursion

I've been looking in the source of Slim::Control::XMLBrowser.pm to see
if I could figure out how to retrieve the entire favorites hierarchy
with a single jsonrpc.js call. I gave up because there's too much goinf
on for somebody new to looking at the code.

["favorites", "items", 0, 300, "want_url: 1"] will only return the top
level favorites and I need to figure out the IDs of the embedded folders
and then repeatedly call  ["favorites", "items", 0, 300,
"item_id:x.y.z", "want_url: 1"] with the folder item_id's to pick up
underlying levels.

The thing is, the search variant ["favorites", "items", 0, 300,
"search:radio", "want_url: 1"] returns all matches regardless of level
but it won't take a wildcard for the search, nor will it take a regexp.


Any pointers as to where the code could be tweaked to get back all the
items with a single call? Or is there a parameter I'm not seeing? 

The MediaServer skill has to call jsonrpc.js from the cloud and
recursion is 'expensive'.


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