Rebuilds the engine active-field list from a serialised state, re-matching each
entry to a live descriptor in config. Unknown ids (config changed since the URL
was produced) and empty selections are dropped, mirroring readActiveFilter. A
taxonomy subValues is kept only beside a non-empty values, minus its malformed
entries; it never makes a selection non-empty on its own.
Rebuilds the engine active-field list from a serialised state, re-matching each entry to a live descriptor in
config. Unknown ids (config changed since the URL was produced) and empty selections are dropped, mirroringreadActiveFilter. A taxonomysubValuesis kept only beside a non-emptyvalues, minus its malformed entries; it never makes a selection non-empty on its own.