No mutation for if-statement with instanceof pattern match

[Stephan202]

In the context of PicnicSupermarket/error-prone-support#1283 I noticed that JaCoCo flagged that this if-statement wasn't covered by tests. Despite that, Pitest reported that all mutants were killed. Afterwards I added another commit to introduce proper coverage.

Sorry for reporting this without a minimal reproduction case; if desired I can find some time for that later. For now just a hunch: could it be that Pitest skips this case due to the instanceof pattern matching?

[Stephan202]

Alright, running a full Pitest analysis does cause an unkilled mutant to be reported. So there's no issue here: Pitest's PR analysis mode was smart enough to see that this branch was unchanged, even though other code in that same method was modified. Sorry for reporting a non-bug!