Diffusion Krita 57ce1ba509ff

Fix gamut masks in advanced color selector

Authored by amedonosova on May 19 2019, 2:28 PM.

Description

Fix gamut masks in advanced color selector

Commit 8441c26fbda introduced a bug into gamut mask handling in the
advanced color selector: the mouse position used to determine if a color
is selectable is not correctly adjusted, that causes a mismatch between
shapes shown on the wheel (which are correct) and selectable area.

BACKPORT:krita/4.2