Fix colors of task icons for colorblind users
The colored circles for almost-due and completed tasks are indistinguishable except upon very close scrutiny. I suspect other colorblind users would have similar problems. Making either (but not both) the green or amber circles a deeper, more saturated color would improve recognition. Making the circles change color with the selected text color would be another option, though probably harder to implement.
Approximately 10% of males are at least partially colorblind! Decreased ability to distinguish red and green (and oranges) due to lowered red sensitivity is one of the most common types. Colors that are desaturated or very close in brightness are the hardest to tell apart. As an example, (0,255,0) is almost indistinguishable from (236,236,0) for me.
You can now choose any icon you like from the icon list to represent each state, thus they can even be different images.
If you want more icons, vote for:
http://taskcoach.uservoice.com/forums/26465-desktop-version-windows-linux-mac-of-task-coach/suggestions/594235-import-new-custom-icons
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@mikael The color of the text can be changed, but the color of the icons doesn't change automatically with the text color.
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mikael commented
Did you try edit->preferences->color?