Feature request,Confirm delete/save changes prompt

Hi all,

I think a prompt on exiting the image editor,asking whether you want to save changes would be a good thing,great for when you have totally botched or for that experimental graphical tweak.

Also a confirmation when deleting a frame in the editor.would save time reloading or worse still losing a frame completely.

I also think this should be the default behavior.

btw I just suggested this two or three days ago!

If you want to revert your changes, just close the editor and press Undo. I think adding a dialog every single time you close the image editor would make the work flow feel clunky for a lot of people.