Am 30.04.2017 um 18:15 schrieb Alain:

> This is the correct and expected behaviour and did not change since
> light_group have been introduced.

Kenneth and Tomas' posts are clear evidence (nay, proof) that it is
/not/ "expected behaviour" - or at least not universally so.

My personal guess is that light groups were originally implemented for a
use case where shadowing objects or media were a non-issue, and thus no
thought was given in that direction whatsoever. And that when the issue
first arose, light groups were well-established already, so that the
developers were reluctant to change the implementation, out of fear of
breaking existing scenes.

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