i would like to suggest that the color selection in color history be inverted, when you press X key the selection goes from right to left and the last color used is at the right, so the selection should be from left to right, i'm finding myself "rotating" the whole color history to select the last color i used, which is just one place right to the current one.
you know, it's like a suggestion, it would be cool to have it fixed that way in the next test build or something, greetings.