Unable to Add New Subregions if Image already has Subregions Segmented

[benneely]

When I go to generate more training data for an image and select, say bronchiole, if some training data has already been generated for that image, I am unable to add new subregions to that image.

[whitews]

I agree this would be nice. It requires some work in the drw-poly directive to allow enabling/disabling of individual polygons. I submitted an issue in the drw-poly repo here.