MyPaint/ColorSelectorUsability


 * The inner wheel ring is rather confusing (optical). It might be better to remove it. (or replace it by a disc?)
 * The dialog should disappear quickly when resting in the center, and not so quickly when moving through (with some velocity).
 * drag on the ring (realtime color feedback)
 * MMB-drag could rotate the hue ring (without clicking on it)
 * If you press the hotkey long the dialog should disappear when released.
 * Do not autorepeat the hotkey press (causing it to flicker between the two dialogs)