Bruno Brito (release notes):

In Tower 15, we introduced the “Fully Merged” badge and Automatic Branch Management to help you keep your repository tidy. With Tower 17, we’re taking the detection behind that badge to a whole new level. […] Tower now matches your local branches against merged pull requests from your hosting service, such as GitHub or GitLab.

[…]

Trust is everything when deleting branches — so we redesigned the “Fully Merged” hint view to show you exactly which checks matched.

[…]

One that is particularly noteworthy is that updating submodules is now significantly faster! Tower gathers each submodule's Git data concurrently instead of one at a time—something you will especially notice in repositories with many submodules.

I’m sad that they got rid of the yellow icon.

Previously:

• Git Tower 16