Comment 12 for bug 1249618

There were some other signals going on, the wheel was certainly much better and would mostly not flip to red except when a refresh was kicked off by the selection code. This signal thread was really hard to follow, so in r14748 I put some hue protection into the gimp colour wheel directly and this should prevent any redness.

It also means that the last used hue will sort of stick around when selecting different white objects, but that's ok as far as design goes.