A Recent Colors chip in the Color or Swatches panel now starts a paint
drag. Dropped on the Swatches panel's list it becomes a swatch of its
color, in its color model, through swatch.new as one undo step: on a
color group or one of its swatches it joins that group, elsewhere it
joins the ungrouped swatches. A click on a chip still paints the
selected art, and a drag does not.
A paint Alt-dropped on Registration now becomes a new swatch instead of
ending in a "can't be edited" error from swatch.edit.