Bug? layer.copyDecomposedLayer() returns layer with 0 dimentional bounds

Scripting
1 
layer = Font.selectedLayers[0]
decLayer = layer.copyDecomposedLayer()
print(decLayer.bounds)  # origin 0,0 | size 0,0
print(layer.bounds)

as in topic: layer.copyDecomposedLayer() returns decomposed layer with 0 dimentional bounds.
I guess, it could be a matter of returned layer that is orphaned. It’s bounds returns 0,0 position with 0,0 size which isn’t true.
I need that orphaned layer to collect some data among which I would like to get actual dimentions of the shapes I have.

2

A layer needs a parent to compute the bounds. A decomposed layer might be fine without it, but I rather have a consistent behavior instead of a failure in some cases.

Why don’t you get the bounds from the original layer?

3

I’m making code that is compatible with both fontparts and glyphs API. It is less messy in my use to do it with an abstract layer.

Nevermind then, I will use fonttool’s BoundsPen to make it work as intended

4

No need to use boundsPen. Just do copy.parent = orig.parent before you get the bounds. But still, why making the copy in the first place?

5

And what fontParts implementation are you working with?

6

No need to use boundsPen. Just do copy.parent = orig.parent before you get the bounds. But still, why making the copy in the first place?

Thanks!
Longer topic: it is connected to the methods of the private library, that I want to use for both RF and G3. There is no nice way to use an original layer.

And what fontParts implementation are you working with?

RoboFont’s implementation.