Add a "ROOT" button to the category selection action bar

Picture I have the following categories tree: Basics→Personal→Care→Stuff and Travel→Transport. Let's say I added a transaction to the Stuff category and now I want to add another to the Travel category. So I open the category selector and have to press "BACK" button 3 times and then press Travel and then press Transport. 

So I added a ROOT button which takes us directly to the category root, so saving 2 taps in this case :)

PS. I admire the app and the code :)