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/** The postSetpixListener of the ActivityConstraint ensures that pixels are
given their maximal activity when they are freshly added to a CPM.
@listens {CPM#setpixi} because when a new pixel is set (which is determined in the CPM),
its activity must change so that this class knows about the update.
@param {IndexCoordinate} i - the coordinate of the pixel that is changed.
@param {CellId} t_old - the cellid of this pixel before the copy
@param {CellId} t - the cellid of this pixel after the copy.
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