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DPL: Fix ownership of the content of Variant - #15939
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Copy and move of Variants holding Array2D, LabeledArray or string array values copied the storage byte by byte, so copies shared the same heap buffers, and the destructor never destroyed these objects, leaking them. Assignments never released the previous content, move assignment of strings and arrays duplicated the buffer and dropped the original one, and move assignment of string arrays corrupted the source vector.
ktf
approved these changes
Oct 13, 2026
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Copy and move of Variants holding Array2D, LabeledArray or string array values copied the storage byte by byte, so copies shared the same heap buffers, and the destructor never destroyed these objects, leaking them. Assignments never released the previous content, move assignment of strings and arrays duplicated the buffer and dropped the original one, and move assignment of string arrays corrupted the source vector.
Prevent constructing a Variant from a temporary vector, as we cannot overtake the ownership of the vector's buffer and have to copy. Assignment from a temporary is left it, because it is used elsewhere in the code - it should be removed first.
Split from #15880.