Adding a country code after entering the phone number behaves strangely

[jgerstle]

Expected Behavior

You should be able to enter a phone number without the cursor jumping around,

Current Behavior

When trying to add an area code the cursor jumps around

Steps to Reproduce

1. Enter 02012341234 country code gb.
2. Try changing the first zero to a +44
3. watch as the cursor moves around as you type