I guess this has been discussed before in here: https://answers.atlassian.com/questions/156779/difference-in-diif-suppression-between-windows-and-mac-sourcetree
Hopefully it helps!
I'm on a Mac and file up to 1Mb work fine. I don't know if the 1.8Mb is the reason for the message - diff suppressed (file size or pattern) or is it "pattern". I don't know what "pattern" means. The file compares OK when using the "External Diff" button which starts FileMerge on my MacBook Pro (OSX 10.8.3)
Supported Platforms macOS Windows We recently introduced support for additional hosting services such as GitHub Enterprise, GitLab (Cloud, Community Edition, Enterprise Edition), and...
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