Skip Build Generation for cases that all lines modified for any by the parents are also included on the other parent

[rafaelmotaalves]

Those cases occur very often, and they don't need to be built and executed because, by definition, those cases won't have conflicts detected.

[pauloborba]

@rafaelmotaalves do we already skip cases in which one of the branches just changed whitespace?

[rafaelmotaalves]

Yes, we do, because we use the semantical diff (diffj) to detect which lines have changed. @pauloborba