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 To make using Sourcetree as simple yet powerful as possible we embed (bundle) dependencies such as Git, Git LFS, and Mercurial. We strive to keep these...
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