Measured headless (390, real touch, a host on a page that scrolls): in the detail view, a drag up from the people
group's floating picture above the sheet scrolled the PAGE (scrollY 0 to 135, en and ar), while the same drag from
the sheet's strip did not. The picture sits outside the sheet and its grab lip, so it had none of their handlers.
It now takes the sheet's capture-phase touch handlers and touch-action:none: a drag from it resizes the sheet (the
grab-zone test holds above the sheet, as for the lip), and a tap is handed back as a click that reaches its
existing @click (open the sheet fully), as before.
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