Hovering a band on the DNA bar now lights the row it names below — a message
band its exact feed row, a tool-schema band the tools group row, the system
band the system row — the reverse of the row-hover-to-band link, so the two
surfaces read as one surface. The echoed row also scrolls into view, confined
to the nearest scrollable ancestor's own scrollport (the capped column): the
row only has to reach the scrollport's visible slice, since a capped column
usually extends below the page fold and a page scroll would drag the pointer
off the pinned band mid-scrub. Clicking a band still lands on the row and
expands it.
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