For any colored item, for example Text.color, one can clic any color on the color box. But selecting pure black, pure white and any other edge color is extremely difficult because one has to clic specifically that pixel.

A common pattern in any designer is to clic, then drag (even outside the box) to select any edge color, then release and the color is selected.

QtC tracks the mouse position, but won't track the mouse release so the color is not selected, this forces the user to pinpoint 1-pixel targets to select any edge color.

It happens that edge colors are very common: black, white, grays and lighter/darker hues.