Improve intersection of multi marker union #226
Merged
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Resolves: python-poetry/poetry#4694
Improves the detection of empty markers when building the intersection of multi markers containing unions and single markers.
Therefore, if the list of markers of the intersection contains single markers and marker unions, the intersection of each marker union with each single marker is made. If the intersection is not a marker union but a single or empty marker, the resulting marker can be simplified.
I checked the new code for 100 % statement coverage. That is why the markers in the test cases may look a bit more complicated than in the examples in python-poetry/poetry#4694. (In order to test all paths it was necessary to use multi markers containing marker unions instead of just using marker unions.)