In PhotoPaint I have a tool "transparency brush" where I simply choose 100% opacity and the transparency is removed.
In Photoshop the eraser tool only gives me more transparency on this already transparent zone.
I know I can duplicate the layer a dozen times to remove the transparency, but I am wondering if such a tool exists on Photoshop.
Edited some time later. My own answer provides a workaround using the original transparency as a mask.