The tab capped the browser column at the left cards' height bounded by
the host scrollport's slice from the card's top edge; that slice added
the scroll offset on top of rect coordinates, so a scrolled or short
pane clamped the card far below the left column — an empty gap under
the composition + trend cards.
Cap the column at the left cards' measured span alone (first card top to
last card bottom, rounded up): the row's stretch then makes it the
card's height, so it ends flush with the two cards at every width where
they sit side by side, while the DNA feed still scrolls inside the card.
Drop the pane-fit plumbing and its now-dead scrollport observation, and
replace the README's stale three-times claim.
The /context dialog scrolled as a whole while the DNA feed rode it, and
scrubbing the composition bar dragged the dialog too — the row reveal's
nearest scrollable ancestor was the dialog card itself. In the tab, the
3x left-column cap let the card outgrow the pane and change height on
every DNA toggle, dragging the head off-screen and the cards below with
it; band picks scrolled the page via scrollIntoView.
Make the card's own fixed zone the rule in every host: head, DNA lens
and block map stay put while only the rows region scrolls. The tab
column caps at the left column's height bounded by the host scrollport's
slice from the card's top edge (browserCapOf), so toggling DNA or
opening categories never moves the cards below; the /context dialog
becomes a filled flex column whose browser card shrinks instead. Row
reveals bind to the card (revealRowInCard): scrubbing and picks never
scroll above it, and the rows region contains its wheel so the page only
moves when the pointer leaves.
The DNA flat feed lays every message out at once, and an uncapped card would
outgrow the page. The browser column now measures the composition and trend
cards stacked beside it — per render, followed by a ResizeObserver for pane
drags and card reflows — and tops out at three times their sum, scrolling
taller content inside; the card head (title, composition bar, notices, and the
DNA feed's lens) stays pinned above the scrolling list. The /context modal
keeps its own single-card scroll and stays uncapped.
bowenliang123