Hold onto the container after a get_property_ptr_ptr() call #20246
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Effects performed after a get_property_ptr_ptr() call may make the property pointer invalid by freeing or reallocating its container. The container might be the object itself, the properties ht, a proxied object, or anything else (for internal classes). Here we change the get_property_ptr_ptr handler so it exposes the actual container. The caller can then increase its refcount if any operation performed before the last access to the property could render the property invalid. The get_property_ptr_ptr() implementation has the responsibility of ensuring that while the container's refcount is incremented, the property pointer remains valid.
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Effects performed after a get_property_ptr_ptr() call may make the property pointer invalid by freeing or reallocating its container.
The container might be the object itself, the properties ht, a proxied object. For internal classes, this can be anything else.
Here we change the get_property_ptr_ptr handler so it exposes the actual container. The caller can then increase its refcount if any operation performed before the last access to the property could render the property invalid.
The get_property_ptr_ptr() implementation has the responsibility of ensuring that while the container's refcount is incremented, the property pointer remains valid.
Possible partial fix for GH-15938. Separate fixes are necessary for ASSIGN_DIM_OP, ASSIGN_OP, and references.
cc @iluuu1994 @nielsdos