ColorPalette needs a 'no color' setting

[peller]

from very, very old ticket #219 Don't know if any editor integration will be required for this feature.

[dylan]

UI suggestions include the following:

• selecting the highlighted color would deselect it and make the no color be the option
• adding a box that is transparent, or has a gray background with an X graphic
• adding a small none button

[peller]

+1 on something generic like an X Let's avoid localized strings, if we can. Selecting the highlighted color should select the highlighted color :)

[bill]

Let's not complicate Editor any more for 1.2.

End users can get a seemingly identical effect on their text/background by picking black or white respectively. Of course I understand the technical difference between so-called "no-color" and black/white, but it doesn't become significant very often, especially since we don't support an HTML editing mode (except as an example of a custom plugin). It would be important if, for example, the background of the text was an image, but that's a corner case.

Let's consider this later on.