Tree view only maps Wikidata entities to tree nodes

[1ec5]

The Tree view only creates nodes for Wikidata entities, not OSM Wiki data items or OSM elements. For example, this query displays nothing even though the table view shows a row for most of the U.S. states:

#defaultView:Tree
SELECT ?osm ?name WHERE {
  ?osm osmt:boundary "administrative";
       osmt:admin_level "4";
       osmt:is_in:country_code "US";
       osmt:name ?name.
}

But replacing the OSM element with a Wikidata entity in the output results in a node for each state:

#defaultView:Tree
SELECT ?wd ?name WHERE {
  ?osm osmt:boundary "administrative";
       osmt:admin_level "4";
       osmt:is_in:country_code "US";
       osmt:name ?name;
       osmt:wikidata ?wd.
}

[1ec5]

The Tree view only displays entities:

https://github.com/Sophox/wikidata-query-gui/blob/3a361428748166f1377f47ac620413df3547f533/wikibase/queryService/ui/resultBrowser/TreeResultBrowser.js#L193-L199

The definition of an entity is limited to Wikidata entities according to a rigid URL pattern:

https://github.com/Sophox/wikidata-query-gui/blob/3a361428748166f1377f47ac620413df3547f533/wikibase/queryService/ui/resultBrowser/helper/FormatterHelper.js#L270-L273

This method is also used in a few other places, all of which seem like they’d benefit from treating OSM Wiki data items and OSM elements the same way as Wikidata entities:

https://github.com/wikimedia/wikidata-query-gui/search?q=isEntityUri

A workaround is to append a corresponding Wikidata entity URL (or a made-up one) to the OSM element URL:

BIND(IRI(CONCAT(STR(?osm), "?entity=", STR(?wd))) AS ?item)