1. Change a file so that only 1 hunk in that file is changed
2. Use the Stage hunk button to stage that hunk
3. When the file appears in the Staged files list, click on it to get a diff

Expected results: you get a diff

Actual results: you get a diff, then SourceTree updates a second or so later, and the diff vanishes, never to return. The only way to get it back is to unstage the file and stage it again. Very distracting