Fix BGridView holder ownership - #22
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cyberman wants to merge 1 commit into
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Problem
An attached BGridView is owned and destroyed by its BWindow, while the Python wrapper still retains deletion responsibility.
Releasing the wrapper can therefore attempt a second deletion during finalization.
Fix
Bind BGridView with a py::nodelete holder.
Validation
Verified that window shutdown and Python finalization complete cleanly for an attached BGridView.