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test/source
Julian Eisel 59adf9cdd6 GPv3: API tweaks to prepare for drag & drop reordering
Minor tweaks to the API to support drag & drop management in the layer tree UI.

These changes were needed for #109826:
- Add `TreeNode.parent_group()`
- Add `LayerGroup.as_node()`
- Use `TreeNode` instead of `Layer` whenever a link is needed to link or unlink a layer.

Pull Request: https://projects.blender.org/blender/blender/pulls/109824
2023-07-07 18:01:50 +02:00
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