The variable-binding list was emitted by the section walker as plain
panel rows — no height cap, no viewport, no scroll — so forty
variables inflated the inspector past the window and the clipped tail
stayed unreachable (yet still clickable through the clip). Rebuild it
as an anchored overlay in the same family as the fill-type and font
pickers: 320px cap with its own wheel scroll, outside-click and
Escape to close, name column ellipsized against a right-aligned hex
column so long tokens never overlap their value. Bind/unbind emission
is unchanged, the stroke-section picker shares the implementation,
and a regression test compares every other panel rect open-vs-closed
so the inline-inflation shape cannot come back.
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