Offer the film stock in its own group, and let its list scroll itself

Two faults in one control, both reported from the tablet.

The stock picker appeared in every group. It is not a parameter, so it is not
a row, so the filter that hides every other control when a group is chosen
never saw it — "Kodachrome" sat at the top of Light, of Colour and of Detail
alike. Three places it does not belong, and the one it does no more prominent
than the rest. The descriptor has said `Effect` and only `Effect` since the
film moved there; nothing was asking it.

So the panel now asks. It cannot ask directly — a generated panel may not know
which operation a control belongs to — so the session answers, from what the
operation declares it is about, and a stock re-declared as something else would
move on its own. The flag is recomputed when the group changes as well as when
the film does, which is the half that would have made it stale exactly when it
mattered.

And the open list was unbounded, so it made the develop column taller and the
column scrolled as one: reaching Velvia dragged every slider below it off the
screen, an answer given once pushing aside the controls used constantly. It now
scrolls within a bounded height of its own.

That viewport is counted rather than measured, for the reason the tool rail
records a few files away: a viewport that asks a layout how tall it wants to be,
while the layout takes its height from the viewport, is a cycle Slint settles by
handing back the height it was given — and the content is then clipped in
silence rather than scrolling. Every row here is one fixed height, so
multiplying is exact.

The group rule has a test. The scrolling does not, and cannot: it is a layout,
and a layout fault is invisible to the compiler and to every assertion that can
be written about it.

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docs/traceability.md

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