ListPopupColumn

A column that automatically aligns the width to the widest item.

The column owns the COUI popup gesture: a single pointer handler resolves the row under the finger, so dragging moves the press highlight between rows and a release selects the row the finger currently rests on.

It also reserves real layout space for the hairline between every adjacent pair of selectable rows, matching COUI, whose adapter interleaves an actual divider View of coui_popup_list_divider_height between items (DefaultAdapter.getDefaultDividerView). Because the hairlines are placed by this measure policy, the exact row bounds and hairline offsets are known during layout and are published to the host directly — no cross-node coordinate resolution, which is what previously left the bounds at zero (a child is positioned before its parent).

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