feaa7bbbcc
Any brush that used the `restore_position_from_undo_step` codepath (i.e. brushes that use `OrigPositionData` to calculate their deformations) had the possibility to cause artifacts due to the nested tbb parallelization causing incorrect usage of TLS data. To fix this we add a call to `threading::isolate_task` to prevent thread stealing. Pull Request: https://projects.blender.org/blender/blender/pulls/129020