The search JSON gains tab support: the new `filter` GET parameter
restricts results to one document type (product, news, download, story,
page, market); the response carries `filter` (active value or null) and
`facets.type` with per-type counts and active flags. Counts stay
complete while a filter is active (keepAllFacetsOnSelection), so tabs
never collapse - except on an empty filtered result, documented in spec
v1.12 clause 7.16.
The parameter is named `filter` because `type` is TYPO3's reserved
page-type parameter and crashes page resolution; like q and page it is
excluded from cHash validation. Facets come from EXT:solr's native
faceting, serialized generically by SearchJsonRenderer - a future
category facet only needs TypoScript.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Oliver Rasche
083f0937e2