Reset does not fully reset color picker

[henryxrl]

Please look at the screen shot of your demo:

What I did was I changed the color enclosed by the red rectangle in the screenshot to a new color, then pressed the reset button. You can see the color in the Knobs panel returned to the default color without a problem, but when I click on it and open the color picker menu, the color shown was still the one I set before the reset.

The following is my naive attempt to trying to fix this bug. However, no success.

Could you please look into this issue? Thanks!!