As is, when renaming a category, you have to retype the entire previous name if you want to edit the original name in case of a typo, ect.

This is what it shows by default. I think it would be better if the box filled in automatically with what was in there originally, like this;

I found myself renaming categories a few times, like "Levelling" to "Leveling" or "Leveling" to "Leveling & Questing"