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Duplicating expressions in if, while, and in boolean conditions are a sign of copy/paste in code.
So there should be a code issue that will detect if there is a sequence of expressions (of minimum 2, but it should work with as many are using the same operator) and if they repeat and are the same, they should be both underlined (or one of them) and notice that there is a duplication.
sample code that happen:
if( test(Point.X) && test (Point.Y) && test(Point.X))
is most likely that the devel wanted to put Point.Z, but he "missed" to replace the X with Z.
The operators: && and || should be checked and the expressions that are compared should be tested on their entire depth.
Added fix in: https://github.com/ciplogic/NRefactory/commit/6e4f648b48445fe3ecc44465616f3384f4a034af