How to remove opacity from selection?

[SHIFT_969]

I'm trying to work with Jumble tool with ~60 opacity to create noise and it makes pixels on the edge of my selection partially transparent, and I don't want that. As I understand, I can't fix this with Jumble tool settings.
Is there any way to select an area and change opacity for all of the pixels to max?

[SHIFT_969]

I figured it out:
1. Select your area (you can Ctrl + click on layer to select all pixels).
2. Go to Edit -> Replace Clolor.
3. From can be anything; To can also be any color but set Alpha to max.
4. Uncheck R, G, B and leave only A checked.
5. Change Tolerance to max.
This should change alpha af all pixels to max.
Hope this hepls someone.

[Mishu Bellringer]

Dude ... thank you so much.

What i've been doing to avoid the transparency issue on the edges of any given selection is "undercoat" a base color in another layer. That way it jumbles with the undercolor.

Your solution is super sleek tho