e5bdfd533b
Grease Pencil layer groups are drawn in the layer tree using `AbstractTreeViewItem`. The problem is that the items can't store their expand/collapse state. This meant that switching e.g. the tabs in the properties editor would reset the collapsed state of layer group items. This PR uses the `GP_LAYER_TREE_NODE_EXPANDED` flag to store the expand/collapse state. The tree view then reads from the flag to expand/collapse the items. This also adds an RNA property to layer groups `is_expanded`. Allows to check from python if a group is expanded in the UI. Pull Request: https://projects.blender.org/blender/blender/pulls/131159
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