I come across some posts (Answers as well as Questions) which I had downvoted due to low quality, however laters creater updated them and now are good ones. But, my downvote was still there and I even forget that I ever voted them.
Isn't it will be better if we get notification when someone edits the question voted by us, so that we can retract or change the vote. It don't make sense to keep question downvoted after improvement.
I find it more relevant with ID questions , when someone new posts the ID questions they are mostly with very less information. As most people don't understand that origin and year of release etc are important parameters. Later , when someone explains them they improve questions.