An arrow key or a screen reader's step outward at the edge of the
square returned the clamped point, which equals the current one, and the
wheel picked it again. For a CMYK fill the pick separated the color
again, so one step at 100% saturation turned C100 into C71 M16 and added
an undo step. color_field now returns no point when the clamped point is
unchanged; with no marker a key or an action still sets a color.
dotCooCoo
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