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Change T& reference to T value copy when capturing a_polygon.back(). Subsequent push_back calls can reallocate the vector, invalidating the reference and causing a dangling read on the next loop iteration. Found via AddressSanitizer.
Uses earcut-triangulated quad with zero-based starting ID and a segment entirely outside the mesh, matching the calling pattern from XmUGrid2dPolylineDataExtractor::ComputeExtractLocations that crashes on GCC-13 Release Linux.
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build.tomlTest plan