Buttons beside the Edit tab's wheel switch between the smooth color wheel,
a segmented wheel of solid patches (24 hues by 5 saturations, its markers
moving as freely as on the smooth wheel) and color bars: one solid bar per
recolored color in row order, where a click selects a bar's row for the
color sliders and a drag moves the row without changing a color. The
dialog opens on the smooth wheel and keeps the choice while it is open;
the dialog field is `display` (`smooth`, `segmented`, `bars`).
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