v13.3.0 release notes, iteration 6: filtered headers and the week's grid fixes

Context

Five PRs that merged on 2026-10-16, after iteration 5 (#19783), change what .github/RELEASE_NOTES/v13.3.0.md must say:

• #19805 (#19793): a filtered column's header shows the state. The menu arrow stays shown and filled, labelled "Filter , active", and a header without a menu draws its own mark. Locked columns are included.
• #19807 (#19806): the issues showcase's fixed-row mode shows each title and summary as one line cut with an ellipsis, instead of a slice from the middle.
• #19799 (#19798): header-wide state reaches the locked regions. One sort arrow shows across all regions, and runtime changes to showHeaderFilters, sortable and useTriStateSorting reach locked headers.
• #19802 (#19800): a sort by a field named index keeps every item. Before, it emptied the collection, as in examples/grid/covid's # column.
• #19803 (#19801): a sortable: false header never sorts on click. Before, the covid table's # header still sorted.

The Problem

• The header-menus chapter describes "the arrow button that appears on hover or focus" but not that a filtered column keeps it shown, nor how a header without a menu marks its filter.
• Also in 13.3's locked-columns bullet stops at #19777.
• Neither sort fix is named, though both were reachable in shipped examples and apps before 13.3.

The Fix

In .github/RELEASE_NOTES/v13.3.0.md only:

• Header menus: after the sentence that lists the ways to open a menu, one sentence on the filtered state (#19805).
• What you can try, step 2: the fixed height now cuts each title and summary to one line (#19807).
• Also in 13.3:
  • the locked-columns bullet gains #19799's runtime half;
  • one new bullet for the two sort fixes (#19800/#19802, #19801/#19803).

The banner, the counts and the Full Changelog lists stay untouched: #19765's cut-prep (PR #19784) removes the banner and regenerates them at its head. That includes "The proof" count, which #19805's two new menu cases move. The screenshots stay. The Author frame's arrow sits under its open menu, and the Area frame already shows a filtered column.

Acceptance Criteria

• AC-1: the header-menus chapter says that a filtered column keeps its arrow shown and filled, with an "active" label, and that a header without a menu marks itself (#19805).
• AC-2: What you can try step 2 describes the fixed-row mode as it now renders (#19807).
• AC-3: Also in 13.3 names #19799 in the locked-columns bullet and the two sort fixes with their issues and PRs.
• AC-4: the banner, counts and changelog lists are unchanged, so this PR and #19784 touch disjoint lines.

Out of Scope

• The record-search toolbar (#19804, design review open). If it lands before the cut, an iteration 7 adds it. That iteration also removes the two lines that defer "a grid-level search toolbar", and moves "two opt-in settings" to three.

Related

• #19712 (parent).
• #19782 / #19783 (iteration 5).
• #19652 (the cut).

Live latest-open sweep: latest 20 open issues at 2026-10-16T13:44Z; no notes-iteration equivalent. #19765 (the cut-prep) is related, not a duplicate. A2A sweep: latest 30 release-notes messages; the only claims are Ada's (lane-intent 11:35Z) and Grace's cut-prep (#19784). MC sweep: one query on this scope's nouns returned Grace's sweep record (the causes of #19798, #19800 and #19801) and the iteration-5 record; neither decides against this scope. Own-assignment sweep: #19712 is the parent; nothing else overlaps.

Origin Session ID: 009de3c6-e0ea-40f0-9381-652ddc9146dd