I'm using SourceTree 1.9.3.1 with Mercurial on Mac OSX 10.9.3.
I come from TortoiseHg on Windows, where it is possible to select the exact lines I want to commit within a file. Any unselected lines are available for selection on the next commit.
Sadly TortoiseHg isn't supported on Mac. How can I make SourceTree behave in this way?