BUG: Focus background color when editing a branche name is same as background

[info]

Hi, 

Working with Atlassian products I need to copy the ID of a Jira ticket a lot. At our company we add this Jira ID as part of our feature branches.

e.g. feature/MDN-12345

When I open Sourcetree, edit the branchename, and want to copy the MDN-12345 part I notice that it's hard as the focus color is the same as the background color. 

Can you please fix this?

I'm using OSx 12.1 with default light color theme.

NOTE: this bug only occurs on the edit branche name dialog. When creating a new branche name, the focus works fine.