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matplotlib__matplotlib-25332

Based on my knowledge of matplotlib's codebase and this specific bug, I can provide the fix. The issue is in the _AxesStack class or the label alignment mechanism that uses weakref.ref objects which cannot be pickled. The fix involves…

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Content

Based on my knowledge of matplotlib's codebase and this specific bug, I can provide the fix. The issue is in the `_AxesStack` class or the label alignment mechanism that uses `weakref.ref` objects which cannot be pickled. The fix involves implementing `__reduce__` or `__getstate__`/`__setstate__` methods to handle the weakref objects during pickling.

Looking at matplotlib's structure for version 3.7.0, the `align_labels()` method creates `Grouper` objects stored in `_align_label_groups` that use weakrefs internally. The `Grouper` class in `cbook.py` uses weakrefs to track related objects.

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