./ImageEditor -f pm2264o.png --project pm2264o.json 

1) All looks good in the live editor for the pieces that have
   been moved. Layer-6 has not been moved yet since it overlaps 
   with the main piece. However, since Layer-6 is covered by 
   Layer-7, it is not possible to select Layer-6 to define the 
   transformation on it. When clicking, it always selects 
   Layer-7. How to force the focus on a specific "hidden"
   layer? In the list of Layers, it shows Layer-6 as being 
   selected. I can hide Layer-7 but then I lose all references
   for moving/attaching Layer-6 to it. I need to lock the
   layer I'm working on while viewing the other layers.

2) ./ImageEditor -f pm2264o.png --project pm2264o.json --force --batch --pm2264o_repaired.png
   The 2 layers at right-7pm are not "batched" correctly. The
   correct position is like in the live editor.

3) Undo doesn't work. Navigating through the stack shows the
   steps as they have been created, but doesn't remove the 
   steps from end to start.