Every TextRow drew a field and a hint but no name: "Filename template"
and "Destination" on the settings page and in the export sheet, the two
storage budgets, the export size fields. The label was there, painted
behind the entry, with a clipped "ws" of "Thumbnails and previews"
poking out beside the thumbnail field.
The field sits in a Rectangle so the row can dim it and watch it lose
focus, and that Rectangle took its height from `field.preferred-height`.
`Field` sets its own `height` outright and has no layout inside it, so
its preferred height is zero. The box was zero tall, the row around it
took its height from the unit label beside it, and the field, centred
on an empty box, sat half its own height above the row, on top of the
FieldRow. Segmented never showed it because its chips live in a layout
that reports a real height.
Reading `field.height` instead gives the box the height the field
actually draws at, so the row reserves it and the label sits above. The
note on `Field.label` that recorded the fault now records the trap.
dtourolle
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