3dfd9d84eb
Caused by parallel access to static clipboard storage: Multiple threads could end up calling `ensure_grease_pencil_clipboard()` in parallel. Here this resulted in a surprisingly reliable memory leak. Use a simple mutex lock to prevent unsynchronized access. Steps to reproduce were: - Add Grease Pencil object - Enter grease pencil Sculpt mode - Select Clone brush asset - Click in 3D Viewport - Quit Blender (see console log for leak reports) Pull Request: https://projects.blender.org/blender/blender/pulls/125428
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