The workspace subfolder discovery returned only the union of every
source's folders, so "Source: temp" could be paired with a folder that
exists only under output and silently match nothing. In workspace mode
each root now lists its own folders, and "Refine this view" offers only
the chosen Source's folders: changing Source keeps a folder it also has
and otherwise returns Folder to "All output folders", as the old field
row did when it reloaded a Source's folders.
Failing before: the API test found no per-root folders (KeyError), the
dialog unit test and the browser test still offered output-only folders
under the input source.
Vito Sansevero
7c362a53ae