cf178f71ac47453e635d5adc07b33a7539b9ac5e
Safe for 2.73... This revert rB9b0ab890676790bb1e8e77797629b889ea66f69e - needed to set that threshold to a small negative value to remove the last artefacts reported in T39735, but now I could not reproduce any with the previous 0.0f value, so restoring it for the time being. If this 'shadowed neighbor face' case re-appears, we can always choose a value in-between, like -1e-18f...
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