Bug 775646 - Levels Tool: handles difficult to read with dark theme.
The white, gray and dark sliders of GimpHandleBar have a black contour. This makes the white and gray slider visible even with similar colored background. On the other hand, the black slider is barely visible on a dark background (and could even be made totally invisible using the same color). So let's use a light-gray contour on the dark slider, making now all sliders working with any background color.
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