Fade "drying" brushes bug

[IgorS]

When I use some of brushes that use drying effect, e.g. "Flat little dirty fade" default brush, it doesn't load a color after second or third stroke until I touch a color in the colour wheel.

[support]

A "dirty mode" enabled for this brushes - it's mean that brush get last mix color from previous stroke. (you can hold F to load it every stroke)