c314ac8ce33ba491bbdfcbacbe18d8e3465f5dc6
It was a regression introduced in rev36301. Average normal calcilation used to fail due to triangular faces which are too slight. Do not use triangles with too small area for average normal calculation.
fix issue raised by [#27819] Unwrap Menu (U) -> Lightmap Pack throws Python Exception. But use a different fix.
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