b14a0ee57e
Some functionality of `Layer`s and `LayerGroup`s can be shared. This is why the `TreeNode` class exists. It encapsulates all the common methods both `Layer`s and `LayerGroup`s should have. Up until now, the usage of `TreeNode` was not consistent and often the layers would just access the base c-struct directly. This refactor makes it so that all of the functions affecting only the `TreeNode` are moved to the `TreeNode` class and only implemented there. For example, renaming a layer is really just renaming the node. Therefor there shouldn't even be a `rename_layer` and `rename_layer_group` function. These were combined into a `rename_node` function. Pull Request: https://projects.blender.org/blender/blender/pulls/111177
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