"Apply filters" (and "Clear filters" with nothing set) reset the stream,
refetched the first page and dropped the reader's scroll position even
when no filter changed. Like the toolbar's equality guard, an unchanged
refinement now does nothing.
Failing before: the browser test counted one listing fetch after an
unchanged Apply; now none, and the loaded cards stay in place.
Vito Sansevero
febc514e42