What if the "hunk" has a part you don't want to stage and commit? For example, I only want to commit lines 50-100, but not 1-50. SourceTree unfortunately sees this as one hunk (line 1-100). I don't know how to commit only the lines I want.
The reason is that the code is addressing two different issues, so we don't want to co-mingle the code if possible.
I guess another way to ask is how do I make SourceTree split into smaller hunks?