> scratches some itches that gitk doesn't quite. Tree visualization of multiple branches... Just a quick PSA that gitk does support multiple branch tree visual

> scratches some itches that gitk doesn't quite. Tree visualization of multiple branches... Just a quick PSA that gitk does support multiple branch tree visualization when started with the 'all' flag i.e 'gitk --all'. This roughly mirrors the CLI's 'git log --graph --all'. (not to say that either of these commands have a better UI/UX than SourceTree)