Situation: I want to use the current selection as a mask on layer X. Layer X already has a mask, and I want to completely replace it.
If layer X didn't already have a mask, I could do this in one step by clicking
Add layer mask in the Layers palette.
Given that layer X already has a mask, what is the quickest way to do this? Can this be done in one or two steps, preferably by keystroke?
How I do it now: Drag layer X's mask to trash, click layer X, click
Add layer mask. This becomes tedious when you have to do it to a lot of layers.