Steps to Reproduce:
1. Save the attached 'test.jsx' file
2. Add the file to a git repo
3. Change the file
4. Select the file in 'Uncommitted Changes'
4. Observe the build-in diff display

Results:
The previous file and the new file are stacked on top of each other instead of actually diffed. The original is first, so long files look like no changes have happened. The diff incorrectly says there's a new line at the beginning AND a removed line at the beginning.

(See attached screenshot.)

Expected Results:
The diff works as usual.

NOTE: This error occurs on both Mac and PC versions of SourceTree. Also, other .jsx files work fine, so I'm not sure why the attached file is having issues. This might be a BOM problem. Also, checking in the file includes the appropriate changes, so this is a diff preview problem only.