My bad, not enough context. It is in these two threads:
The OP has made a new part which we helped him improve and now wants to substitute the new part for the old one without redoing the sketch. That seems to be possible if both parts are in the mine parts bin (the new parts editor will replace the svgs and update the sketch) but not if both parts are in the temp bin (parts editor won’t save the part from the temp bin except as a new part which doesn’t update the sketch). I also just discovered that the pin numbers on the latest part are all different which will break this entirely I think, but I’m still interested in learning how an updated part can be slid in to an existing sketch (as long as the pins have remained the same). On a different topic, I have a development environment for Fritzing sort of up (there are a number of problems) and have discovered where and even how to fix my favorite bug where a corrupted part file hangs fritzing, but the fix isn’t going to be that simple. There is no error checking on the return from the parts load which causes a seg fault when it tries to update the part (and thus the hang) and I have to figure out how to delete the files that it has already loaded which doesn’t look that easy but should be possible with enough work.
Peter