While retouching pictures I like to add a HSL layer on the top in order to completely de-saturate my image, as this helps with the skin retouching process.
Currently though there is no way to get the brush to sample the colour of the selected layer I'm working on, instead it will always pickup the de-saturated colour caused by the HSL layer.
Even when setting the "picker" tool sample to "Current Layer" this behaviour doesn't change.
What I would need is an option to sample colours only from the selected layer rather than all visible layers.
I recorded a video to explain this with a practical example - I hope it's clear enough: