REQ-UI-CONTROLS-PANEL said the content scrolls once it outgrows the space
available; only the height cap was implemented, so the surplus rows were simply
cut off. Silent row loss is the one failure this panel must not have, and it
was reachable: the Selection context runs to fifteen rows, and a panel that has
also had to rise above the build button bar can be left with less room than
that.
The rows move into a scroll area. The heading stays outside it, so it remains
visible and remains the collapse control whatever the rows are doing.
The size can no longer come from the panel's own layout -- a scroll area's hint
describes a viewport, not its contents -- so the heading and the rows are
measured directly and the chrome added. Verified against a forced rebuild and
an artificially cramped view:
roomy: heading 56x13 + rows 124x188 -> 142x223, no scrollbar
collapsed: -> 74x31, same bottom edge
cramped: wanted 223, band 124 -> 159x124, +17 for the scrollbar
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YHcUerKAZKWNvSKJxYKbnG
Malte Langkabel
97c269576e