When working with several custom text fields on a slide, it gets very confusing when the order of the text fields doesn't match their location in the slide. For example, you might have three text fields, then realise you need to add another one at the top of the slide. But when you do so, the new field will append to the end of the list, which makes it very confusing when you need to edit the slide in the future.
It would be really helpful if you could re-arrange custom text fields by dragging and dropping.
