Comment 24 for bug 906516

I realized that if I wanted somewhat darker colors for the cell background, I needed a white foreground color for the text. The solution for tags-based coloring in GTG is to always use a very pale background. For urgency-based coloring I think it makes sense to use dark backgrounds for specific tasks (e.g. overdue).

I ended up changing lilblarch so that text is rendered white if the background brightness is larger than a threshold, see attached. Any better ideas?