Streamline conditions derivation usage

The following discussion from !2039 (merged) should be addressed:

@cattanem started a discussion: (+2 comments)

@graven, apart from the lambda arguments, the code on lines 22:32 is identical to the code in VPTrackingInfo.cpp lines 25:36. Do you see a way that it could be factorised into a single implementation?

Edited Aug 02, 2019 by Gerhard Raven

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