660867fa00
Store the 'expanded/collapsed' state of the bone collection tree view in the DNA data of the bone collections themselves. This way the tree state is restored when loading the file. This commit also adds some code to the abstract tree view classes, for supporting synchronisation of the extended/collapsed state between it and external data. It follows the same approach as the handling of the active element. RNA wrappers have been added to make it possible for Python code to expand/collapse parts of the tree. Library overrides are supported for this property, so the expanded/collapsed state of linked armatures can be locally saved. If there is no override, the `is_expanded` property is still editable; changes will not be saved to file in that case, though. Pull Request: https://projects.blender.org/blender/blender/pulls/116940
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