The enclosed patch to the coder XCF allows ReadXCFImage to respect ->subimage and ->subrange. It currently doesn't with version 1.3.14.
This can be trivially tested with :
gm convert multi-layer.xcf one-layer.png
If multi-layer.xcf has 5 layers, this will produce one-layer.png.0 to one-layer.png.4 instead of just one file.
Similar problem with
gm convert multi-layer.xcf one-layer.gif
This will copy all layers into one-layer.gif
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