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946e0f4945
Retained native candidates and framebuffer targets are both linear
buffers with the same pitched layout. Publish partial damage using
CopyBufferRegion with byte offsets instead of encoding the ranges as
texture-footprint copies.
Collapse full-width rectangles into one command. Fall back to a full
copy when the partial path would exceed 256 commands, copy at least a
full frame of data, or receive invalid damage coordinates.
This removes the native-only command path introduced by 650636cc that
can fault the D3D12 copy queue after RGB24 benchmarking selects native.