Also, in the latest version, the

uv.zenuv_arrange_transform

(Arrange Islands) operator was simplified and updated. Notice that in my script example I'm using the

area_size

argument instead of

limit

(which was in your example). I highly recommend updating the addon to the latest version. I'm not entirely sure what exact task you're trying to solve based on your snippet, but let me make a quick guess that might be helpful. If you're using Arrange Islands just to lay out islands in UV space, you might want to use the Pack operator instead. It prevents islands from overlapping each other (unless that option is explicitly enabled).