9a59372f07
The code was relying on the layer cache through `groups_for_write`/`layers_for_write`. The `group->runtime->layer_group_cache_` stores all the child groups instead of groups on first level. This leads to crash when recursively deleting group i.e. group at third level has been deleted but `layer_group_cache_` of first level group will still point to address of freed memory. The fix removes the use of the cache and iterates over the direct children in `group.children` and deletes them recursively. Pull Request: https://projects.blender.org/blender/blender/pulls/130082
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