Thanks Grue,straight forward when you know how to...
The behavior of scaling a layer with a layer mask is indeed very strange (it
also creates a floating selection for some reason?)
There's a workaround though (two workarounds, in fact)
1. Put your layer inside of a layer group, and scale the layer group. This will
scale both the layer and the mask.
2. Link your layer (in your layer dialog there's one column for visibility and
one for linking). Again, this will cause all transformations to be performed on
both the layer and its mask. Just remember to unlink it when you're done with
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