Seth's comment is correct, it uses the OS default.
But a more complete answer is you can also customize the default behavior for non-default editors through Tools > Options > Custom Actions. In theory at least, because with v18.104.22.168 it doesn't work too well because my editor remains in the background. But that's better than nothing, if you can't change the system default (can be inconvenient for HTML, for example). In my experience you have to restart SourceTree for this to take effect, by the way (the program doesn't inform you of that, which made me waste time on pointless "troubleshooting").
Badges are a great way to show off community activity, whether you’re a newbie or a Champion.Learn more
Supported Platforms macOS Windows To make using Sourcetree as simple yet powerful as possible we embed (bundle) dependencies such as Git, Git LFS, and Mercurial. We strive to keep these...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs