more about floating layers

[Ofnuts]

(01-21-2018, 10:58 PM)Espermaschine Wrote: on 1)
Well what you can do is activate the 'Show Layermask' option and move it around.
But this can not be reversed, as the layerboundaries "eat away" whats outside.

Yes, it's clipped tot the layer contents. It works like Layer>Transform>Offset without the "wrap" option.

(01-21-2018, 10:58 PM)Espermaschine Wrote: So it seems the only way you can work non-destructively is making the mask on another layer and copying it, or applying the mask from an alpha selection.

(01-21-2018, 10:58 PM)Espermaschine Wrote: on 2)
is that the explanation why Offset works on a layer ?

No this is an answer to the Select-outside-canvas question