Hi Quark,
I know you've had your hands full with updates to the new G4P since Processing 3 came out. I presume that you just haven't gotten around to adding the resizing ability for GWindows in the new release of G4P?
If it's there, please point me to the correct method to use, I'm not seeing one. :) Otherwise, take this as a friendly/patient up-vote for the feature.
Thanks! Rudnik