Ultimately Sourcetree relies on the 'git diff' command for that information. Typically you will see that if the file is binary or encoded as something other than ASCII.
You can see what git thinks the diff is by opening the Terminal and running git diff against that file. See https://git-scm.com/docs/git-diff
Supported Platforms macOS Sourcetree has a lot to offer and, like many developer tools, finding and using it all can be a challenge, especially for a new user. Everyone might not love ...
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