Thanks for your attention, I've got a case all written up.
Its as small as I could make it, it does have a lot of GTK junk to get
all the stuff together.
It makes the same errors as my plugin, to reiterate; to make it crash you can
a) Zoom in/out and move around
b) Zoom in/out and zoom in the opposite direction again.
I didn't include the code to make the image back to normal at the end,
so the layer will stay resized :/
Gimp-developer mailing list