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Counter diffs commute, so transforming them can incorrectly cancel local undo after remote increments. Add regression test for issue #905.
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This was referenced Jan 22, 2026
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Fixes issue #905 where UndoManager undo could be canceled by remote counter diffs. Counter diffs commute, so their transform is now a no-op. Adds a regression test covering local increment + remote increment + undo/redo.