78409a3996
The `drawing_index` in frame data can become invalid during transform if a frame overwrites another. This is very difficult to keep track of explicitly, so instead this fix just "freezes" drawing indices by adding a user at the beginning of the transform to every existing drawing and removing it at the end after all frame data has been updated. No `drawing_index` needs to be updated during the transform. Pull Request: https://projects.blender.org/blender/blender/pulls/126312