Simple lean plugin, works well

This is my “go to” plugin when I need widget class functionality due to it’s simplicity. Well done.

My only recommendation would be moving the class field to the end of the widget (or making the priority filterable so it can be moved there). I find that normally when I need to use widget classes, it is only on a few widgets – a small minority – so having that field front and center top of every widget seems to be overkill.