Check _selected_block_code is still valid before disconnecting#207
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Check _selected_block_code is still valid before disconnecting#207
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Previously, it was possible for _selected_block_code to refer to an object which had been freed, which resulted in an error when calling disconnect for its signals.
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Previously, it was possible for _selected_block_code to refer to an object which had been freed, which resulted in an error when calling disconnect for its signals.