Broken color value change with hotkeys

[JoseConseco]

I have linked color value change (+/-) to K/L hotkey.
It works great when under color wheel HSL sliders are visible. But when I disable sliders, K/L hotkey gets buggy:
- picking color -> then adjusting value with K or L, changes brightness of previous paint color (before picking).
Steps:
- paint with white
- pick gray color
- darken color with K key (in my setup)
- color goes darker shade of white (but it should go darker shade of current color - gray)

http://prntscr.com/r96p1e

[support]

Hm, I've checked it and all fine with visible or hidden HSV sliders. Is there anyone else who has the same issue?