WeBWorK in Runestone without showPartialCorrectAnswers

[Oscar Levin]

In my discrete book I have some WeBWorK problem from the OPL that have `$showPartialCorrectAnswers = 0;`.  For example, Exercise 6.  I like that it has this feature; I think it makes the question less guessable.  However, I've run into weirdness when students are assigned this problem in Runestone.  I think it might be doing things like recording when an answer to part (a) is correct and part (b) is incorrect, but then on a second attempt, when part (a) is now incorrect and part (b) is correct, giving the green checkmark on the problem but still not saying it is correct.  Maybe.  It is confusing to test.

I'm totally fine if the answer is just "never use problems with this flag set."  But there are other issues with the question (it was written using the old PGchoicesmacros, for example), so I thought I'd see if this is something I should expect to work and I just need to recode the problem (which now I can do thanks to bare PG!). 

I don't understand the way that answers are restored on Runestone so I'm mostly curious if this sort of thing is possible.