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I noticed that the "Copy Layer" function is not working properly anymore in version 0.27.9. It was working fine in a previous version I was using (don't remember which one).
1) Open gds and lyp file:
2) Edit > Layer > Copy Layer (I want to copy layer 3/0 to layer 4/0):
If I remember well, in the previous version the "empty" layers did show up in the drop-down list and could be selected. As this is not the case anymore, I select "New Layer .."
3) When applying the copy, the layer is copied to layer "DUMMY 10/0" and not to layer 4/0:
Can you reproduce?
Note that if you do not load the lyp file it does work as intended...