Le 19/12/2025 à 17:23, Koji Yokota a écrit :
I checked with the order of destructor calls. The destructor of Buffer class is 
called before that of UndoGroupHelper class, whereas UndoGroupHelper is 
dependent on Buffer class.

It seems the destructor of Buffer class should make it sure that all 
UndoGroupHelper classes have finished.

It would be interesting to see what theBufferList().isLoaded(buf) and theBufferList().isInternal(buf) return in the helper destructor. The question is to know how it is possible to detect that the buffer has been destroyed.

Do you see some backtrace leading to the destructors.

JMarc
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