ValidatedColors that don't allow alpha values probably shouldn't show the text box to modify the alpha value in the color picker pop up. I noticed that the text gets grayed out, but it still isn't very clear that alpha values aren't allowed. Additionally, I think that the hex code that gets displayed also shouldn't show the alpha value

The code should already only show 6 hex digits if no alpha is allowed, I'll take a look though.

A separate popup layout without alpha edit box at all is possible, I'll consider that too.

0.6.6 - Updated the color popup with this suggestion; in opaque mode, the alpha box will be gone and the hex box will expnd to take it's place. Also added a submit button to the hex box to improve overall behavior of the widget.